- Alpha, T. R., 1991, Oblique map of Yosemite Valley, Yosemite National Park, central Sierra Nevada, California: IMAP 2149, 1 map :col. ;sheet 91 x 90 cm., folded in envelope 30 x 24 cm.,
- Bartow, J. A., 1991, Geologic map of the northwestern Caliente Range, San Luis Obispo County, California: IMAP 2077, 1 map :col. ;sheet 96 x 116 cm., folded in envelope 30 x 24 cm. +1 sheet (61 x 102 cm.),
- Bohannon, R. G., 1991, Geologic map of the Jacobs Well and southern part of the Elbow Canyon quadrangles, Mohave County, Arizona: IMAP 2167, 1 map :col. ;66 x 47 cm., on sheet 86 x 109 cm., folded in envelope 30 x 24 cm.,
- Bohannon, R. G.; Lucchitta, Ivo, 1991, Geologic map of the Mount Bangs Quadrangle, Mohave County, Arizona: IMAP 2166, 1 map :col. ;57 x 47 cm., on sheet 86 x 107 cm., folded in envelope 30 x 24 cm.,
- Bohannon, R. G.; Lucchitta, Ivo; Anderson, R. E., 1991, Geologic map of the Mountain Sheep Springs Quadrangle, Mohave County, Arizona: IMAP 2165, 1 map :col. ;58 x 47 cm., on sheet 74 x 109 cm., folded in envelope 30 x 24 cm.,
- Boudette, E. L., 1991, Geologic map of the Kennebago Lake Quadrangle, Franklin County, Maine: IMAP 2058, 1 map :col. ;44 x 32 cm., on sheet 86 x 101 cm., folded in envelope 30 x 24 cm. +1 pamphlet (12 p. ; 28 cm.),
- Bowers, W. E., 1991, Geologic map of Bryce Canyon National Park and vicinity, southwestern Utah: U.S. Geological Survey IMAP 2108, 1 map: 124 x 91 cm; 1 pamphlet: 15 p.,
- Case, J. E., 1991, Geologic map of the northwestern part of the Uncompahgre Uplift, Grand County, Utah, and Mesa County, Colorado, with emphasis on Proterozoic rocks: IMAP 2088, 2 maps :col. ;on sheets 139 x 81 cm. and 127 x 86 cm., folded in envelope 30 x 24 cm. +1 pamphlet (16 p. ; 28 cm.),
- Chapman, M. G.; Masursky, Harold; Dial, A. L., Jr., 1991, Geologic map of science study area 1B, west Mangala Valles region of Mars: IMAP 2087, 1 map :col. ;61 x 61 cm., on sheet 104 x 127 cm., folded in envelope 30 x 24 cm.,
- Chapman, M. G.; Masursky, Harold; Scott, D. H., 1991, Geologic map of science study area 2, north Kasei Valles, Mars (MTM 25072 Quadrangle): IMAP 2107, 1 map :col. ;61 x 57 cm., on sheet 105 x 138 cm., folded in envelope 30 x 24 cm.,
- compiled by Sims, P. K.; Peterman, Z. E.; Hildenbrand, T. G.; Mahan, S. A., 1991, Precambrian basement map of the Trans-Hudson orogen and adjacent terranes, northern Great Plains, U.S.A.: IMAP 2214, 1 map :col. ;89 x 83 cm., on sheet 101 x 112 cm., folded in envelope 30 x 24 cm. +1 pamphlet (53 p. ; 28 cm.),
- Condit, C. D., 1991, Lithologic map of the western part of the Springerville volcanic field, east-central Arizona: IMAP 1993, 2 maps :col. ;132 x 69 cm., on sheets 142 x 104 cm. and 142 x 91 cm., folded in envelope 30 x 24 cm. +1 sheet (142 x 92 cm.),
- Condon, S. M., 1991, Geologic and structure contour map of the Ute Mountain Ute Indian Reservation and adjacent areas, southwest Colorado and northwest New Mexico: IMAP 2083, 1 map :col. ;58 x 77 cm., on sheet 78 x 112 cm., folded in envelope 30 x 24 cm.,
- Covington, H. R.; Weaver, J. N., 1991, Geologic map and profiles of the north wall of the Snake River Canyon, Thousand Springs and Niagara quadrangles, Idaho: IMAP 1947-C, 1 map :col. ;sheet 86 x 114 cm., folded in envelope 30 x 24 cm.,
- Denson, N. M.; Crysdale, B. L., 1991, Geologic map showing total thickness of coal in the north half of the Powder River basin, southeastern Montana and northeastern Wyoming: IMAP 2131-A, 1 map :col. ;83 x 120 cm., on sheet 101 x 147 cm., folded in envelope 30 x 24 cm.,
- Denson, N. M.; Crysdale, B. L., 1991, Geologic map showing total thickness of coal in the south half of the Powder River basin, northeastern Wyoming: IMAP 2131-B, 1 map :col. ;83 x 123 cm., on sheet 101 x 147 cm., folded in envelope 30 x 24 cm.,
- Denson, N. M.; Pierson, C. T., 1991, Geologic map showing the thickness and structure of the Anderson-Wyodak coal bed in the north half of the Powder River Basin, southeastern Montana and northeastern Wyoming: IMAP 2094-A, 1 map :col. ;83 x 118 cm., on sheet 106 x 144 cm., folded in envelope 30 x 24 cm.,
- Denson, N. M.; Pierson, C. T., 1991, Geologic map showing the thickness and structure of the Anderson-Wyodak coal bed in the south half of the Powder River basin, northeastern Wyoming: IMAP 2094-B, 1 map :col. ;83 x 123 cm., on sheet 101 x 145 cm., folded in envelope 30 x 24 cm.,
- Diffendal, R. F., Jr., 1991, Geologic map showing configuration of the bedrock surface, North Platte 1 degree by 2 degrees Quadrangle, Nebraska: IMAP 2277, 1 map :col. ;44 x 67 cm., on sheet 63 x 104 cm., folded in envelope 30 x 24 cm.,
- Drewes, Harald, 1991, Geologic map of the Big Hatchet Mountains, Hidalgo County, New Mexico: IMAP 2144, 1 map :col. ;on sheet 142 x 94 cm., folded in envelope 30 x 24 cm.,
- Drewes, Harald, 1991, Geologic map of the Swisshelm Mountains, and a description of the development of the Swisshelm and Pedregosa Mountains, Cochise County, Arizona: IMAP 2177, 1 map :col. ;88 x 37 cm., on sheet 140 x 105 cm., folded in envelope 30 x 24 cm.,
- Duffield, W. A.; Wohletz, G. H.; Maasen, L. W.; Dengo, Gabriel; Pinzon, Oscar, 1991, Geologic map of Tecuamburro Volcano and surrounding area, Guatemala: IMAP 2197, 1 map :col. ;51 x 44 cm., on sheet 96 x 124 cm., folded in envelope 30 x 24 cm.,
- EEZ-SCAN 87 Scientific Staff, 1991, Atlas of the U.S. Exclusive Economic Zone, Atlantic continental margin: IMAP 2054, 1 atlas (174 p.) : ill., maps (some col.) ; 56 cm.,
- EEZ-SCAN Scientific Staff, 1991, Atlas of the U.S. Exclusive Economic Zone, Bering Sea: IMAP 2053, 1 atlas (145 p.) : ill., maps (some col.) ; 56 x 49 cm.,
- edited by Fullerton, David S.; Richmond, Gerald M.; state compilations by Fullerton, David S.; Cowan, W. R.; Sevon, W. D.; Goldthwait, R. P.; Farrand, W. R.; Muller, E. H.; Behling, R. E.; Stravers, J. A.; edited and integrated by Fullerton, David S.; Richmond, Gerald Martin, 1991, Quaternary geologic map of the Lake Erie 4 degrees x 6 degrees quadrangle, United States and Canada: IMAP 1420(NK-17), 1 map :col. ;44 x 51 cm., on sheet 96 x 142 cm., folded in envelope 30 x 24 cm. +1 pamphlet (8 p. ; 28 cm.),
- edited by Kieffer, H. H.; Jaovsky, B. M.; Snyder, Conway; Matthews, M. S.; Gehrels, Tom, 1991, Topographic maps of the polar, western, and eastern regions of Mars: IMAP 2160, 4 remote sensing images on 3 sheets ;55 x 71 cm. and 47 cm. diam., sheets 96 x 76 cm. and 71 x 102 cm., folded in envelope 30 x 24 cm.,
- Franczyk, K. J., 1991, Stratigraphic and time-stratigraphic cross sections of Phanerozoic rocks along line C-C‘, Uinta and Piceance basin area, southern Uinta Mountains to northern Henry Mountains, Utah: IMAP 2184-C, 2 sections :col. ;sheets 127 x 94 cm. and 101 x 117 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Arabia Northeast Quadrangle (MC-12 NE) of Mars: IMAP 2098, 1 map ;43 x 59 cm., on sheet 80 x 67 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Arabia Southeast Quadrangle (MC-12 SE) of Mars: IMAP 2099, 1 map ;40 x 59 cm., on sheet 78 x 67 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Arabia Southwest Quadrangle (MC-12 SW) of Mars: IMAP 2100, 1 map ;40 x 59 cm., on sheet 78 x 67 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Arabia Northwest Quadrangle (MC-12 NW) of Mars: IMAP 2101, 1 map ;43 x 59 cm., on sheet 80 x 67 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Iapygia Northeast Quadrangle (MC-21 NE) of Mars: IMAP 2102, 1 map ;40 x 59 cm., on sheet 80 x 67 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Iapygia Southeast Quadrangle (MC-21 SE) of Mars: IMAP 2103, 1 map ;43 x 59 cm., on sheet 81 x 67 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Iapygia Southwest Quadrangle (MC-21 SW) of Mars: IMAP 2104, 1 map ;43 x 59 cm., on sheet 80 x 67 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Iapygia Northwest Quadrangle (MC-21 NW) of Mars: IMAP 2105, 1 map ;40 x 59 cm., on sheet 81 x 67 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Memnonia Southeast Quadrangle (MC-16 SE) of Mars: IMAP 2109, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Memnonia Southwest Quadrangle (MC-16 SW) of Mars: IMAP 2110, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Tharsis Northeast Quadrangle (MC-9 NE) of Mars: IMAP 2111, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Tharsis Southeast Quadrangle (MC-9 SE) of Mars: IMAP 2112, 1 map ;40 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Tharsis Southwest Quadrangle (MC-9 SW) of Mars: IMAP 2113, 1 map ;40 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Mare Tyrrhenum Northeast Quadrangle (MC-22 NE) of Mars: IMAP 2114, 1 map ;40 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Mare Tyrrhenum Southeast Quadrangle (MC-22 SE) of Mars: IMAP 2115, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Mare Tyrrhenum Southwest Quadrangle (MC-22 SW) of Mars: IMAP 2116, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Mare Tyrrhenum Northwest Quadrangle (MC-22 NW) of Mars: IMAP 2117, 1 map ;40 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Aeolis Northeast Quadrangle (MC-23 NE) of Mars: IMAP 2118, 1 map ;40 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Aeolis Southeast Quadrangle (MC-23 SE) of Mars: IMAP 2119, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Aeolis Southwest Quadrangle (MC-23 SW) of Mars: IMAP 2120, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Aeolis Northwest Quadrangle (MC-23 NW) of Mars: IMAP 2121, 1 map ;40 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Sinus Sabaeus Northeast Quadrangle (MC-20 NE) of Mars: IMAP 2122, 1 map ;40 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Sinus Sabaeus Southeast Quadrangle (MC-20 SE) of Mars: IMAP 2123, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Sinus Sabaeus Southwest Quadrangle (MC-20 SW) of Mars: IMAP 2124, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Sinus Sabaeus Northwest Quadrangle (MC-20 NW) of Mars: IMAP 2125, 1 map ;40 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Elysium Northeast Quadrangle (MC-15 NE) of Mars: IMAP 2126, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Elysium Southeast Quadrangle (MC-15 SE) of Mars: IMAP 2127, 1 map ;40 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Elysium Southwest Quadrangle (MC-15 SW) of Mars: IMAP 2128, 1 map ;40 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Elysium Northwest Quadrangle (MC-15 NW) of Mars: IMAP 2129, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Phoenicis Lacus Southeast Quadrangle (MC-17 SE) of Mars: IMAP 2132, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Phoenicis Lacus Southwest Quadrangle (MC-17 SW) of Mars: IMAP 2133, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Amenthes Northeast Quadrangle (MC-14 NE) of Mars: IMAP 2134, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Amenthes Southeast Quadrangle (MC-14 SE) of Mars: IMAP 2135, 1 map ;40 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Amenthes Southwest Quadrangle (MC-14 SW) of Mars: IMAP 2136, 1 map ;40 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of the Amenthes Northwest Quadrangle (MC-14 NW) of Mars: IMAP 2137, 1 map ;43 x 59 cm., on sheet 81 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 10122 Quadrangle, Arsia Mons region of Mars: IMAP 2171, 1 remote-sensing image ;61 x 60 cm., on sheet 96 x 68 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Topographic map of Mars: IMAP 2179, 3 remote sensing images :col. ;33 x 85 cm. and 28 cm. diam., on sheet 84 x 92 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 45062 Quadrangle, Tempe Fossae Region of Mars: IMAP 2187, 1 remote-sensing image ;61 x 45 cm., on sheet 94 x 56 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 45067 Quadrangle, Tempe Fossae Region of Mars: IMAP 2188, 1 remote-sensing image ;61 x 45 cm., on sheet 96 x 54 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 50063 Quadrangle, Tempe Fossae region of Mars: IMAP 2189, 1 remote-sensing image ;62 x 55 cm., on sheet 96 x 61 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 35082 Quadrangle, Mareotis/Tempe region of Mars: IMAP 2190, 1 remote-sensing image ;61 x 52 cm., on sheet 96 x 61 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 35087 Quadrangle, Mareotis/Tempe region of Mars: IMAP 2191, 1 remote-sensing image ;61 x 52 cm., on sheet 96 x 59 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 35092 Quadrangle, Mareotis/Tempe region of Mars: IMAP 2192, 1 remote-sensing image ;61 x 52 cm., on sheet 96 x 59 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 40082 Quadrangle, Mareotis/Tempe region of Mars: IMAP 2193, 1 remote-sensing image ;61 x 49 cm., on sheet 96 x 56 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 40087 Quadrangle, Mareotis/Tempe Region of Mars: IMAP 2194, 1 remote-sensing image ;61 x 49 cm., on sheet 96 x 56 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 40092 Quadrangle, Mareotis/Tempe region of Mars: IMAP 2195, 1 map ;61 x 49 cm., on sheet 94 x 56 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 05117 Quadrangle, Arsia Mons Region of Mars: IMAP 2216, 1 remote-sensing image ;61 x 61 cm., on sheet 95 x 69 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 05122 Quadrangle, Arsia Mons region of Mars: IMAP 2217, 1 remote-sensing image ;61 x 61 cm., on sheet 96 x 68 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 05127 Quadrangle, Arsia Mons region of Mars: IMAP 2218, 1 remote-sensing image ;61 x 61 cm., on sheet 96 x 69 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 10102 Quadrangle, Ascreaus Mons region of Mars: IMAP 2219, 1 remote-sensing image ;62 x 61 cm., on sheet 95 x 69 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 10107 Quadrangle, Ascreaus Mons region of Mars: IMAP 2220, 1 map ;61 x 61 cm., on sheet 94 x 66 cm., folded in envelope 30 x 24 cm.12,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 10117 Quadrangle, Arsia Mons region of Mars: IMAP 2221, 1 remote-sensing image ;61 x 61 cm., on sheet 97 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 20252 Quadrangle, Tyrrhena Patera region of Mars: IMAP 2222, 1 remote-sensing image ;61 x 58 cm., on sheet 95 x 69 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 20257 Quadrangle, Tyrrhena Patera region of Mars: IMAP 2223, 1 remote-sensing image ;62 x 59 cm., on sheet 95 x 68 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 25257 Quadrangle, Tyrrhena Patera Region of Mars: IMAP 2224, 1 remote-sensing image ;61 x 56 cm., on sheet 96 x 61 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 15132 Quadrangle, Olympus Mons region of Mars: IMAP 2227, 1 remote-sensing image ;61 x 60 cm., on sheet 95 x 69 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 15127 Quadrangle, Olympus Mons region of Mars: IMAP 2228, 1 map ;61 x 60 cm., on sheet 94 x 66 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 10137 Quadrangle, Olympus Mons region of Mars: IMAP 2229, 1 remote-sensing image ;61 x 60 cm., on sheet 96 x 69 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the south polar area (MTM 90000: revised), Planum Australe region of Mars: IMAP 2269, 1 remote-sensing image ;61 cm. diam., on sheet 96 x 68 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 85080 Quadrangle (revised), Planum Australe region of Mars: IMAP 2270, 1 remote-sensing image ;on sheet 96 x 68 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Satellite image map of Antarctica: IMAP 2284, 1 remote sensing image :col. ;on sheet 103 x 142 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 25062 Quadrangle (revised), Kasei Vallis region of Mars: IMAP 2292, 1 remote-sensing image ;61 x 57 cm., on sheet 96 x 67 cm., folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1991, Controlled photomosaic of the MTM 25067 Quadrangle (revised), Lunae Planum region of Mars: IMAP 2293, 1 remote-sensing image ;61 x 56 cm., on sheet 96 x 63 cm., folded in envelope 30 x 24 cm.,
- Haney, E. M.; Grolier, M. J., 1991, Geologic map of major Quaternary eolian features, northern and central coastal Peru: IMAP 2162, 1 map :col. ;on sheet 142 x 102 cm., folded in envelope 30 x 24 cm.,
- Hardie, J. K., 1991, Cross sections showing coal stratigraphy of the southwestern Powder River basin, Wyoming: IMAP 1959-C, 1 map :col. ;74 x 55 cm., on sheet 86 x 134 cm., folded in envelope 30 x 24 cm.,
- Hettinger, R. D.; Honey, J. G.; Nichols, D. J., 1991, Chart showing correlations of upper Cretaceous Fox Hills Sandstone and Lance Formation, and lower Tertiary Fort Union, Wasatch, and Green River formations, from the eastern flank of the Washakie Basin to the southeastern part of the Great Divide Basin, Wyoming: IMAP 2151, 19 sections on 1 sheet ;sheet 105 x 145 cm., folded in envelope 30 x 24 cm.,
- Hettinger, R. D.; Kirschbaum, M. A., 1991, Chart showing correlations of some upper Cretaceous and lower Tertiary rocks, from the east flank of the Washakie Basin to the east flank of the Rock Springs Uplift, Wyoming: IMAP 2152, 16 sections on 1 sheet ;sheet 99 x 145 cm., folded in envelope 30 x 24 cm.,
- Hobbs, S. W.; Hays, W. H.; McIntyre, D. H., 1991, Geologic map of the Bayhorse area, central Custer County, Idaho: IMAP 1882, 1 map :col. ;71 x 69 cm., on sheet 106 x 147 cm., folded in envelope 30 x 24 cm +1 pamphlet (14 p. ; 28 cm.),
- Horton, J. W., Jr.; Drake, A. A., Jr.; Rankin, D. W.; Dallmeyer, R. D., 1991, Preliminary tectonostratigraphic terrane map of the central and southern Appalachians: IMAP 2163, 1 map :col. ;84 x 90 cm., on sheet 101 x 137 cm., on sheet 30 x 24 cm. +1 pamphlet (15 p. ; 28 cm.),
- Johnson, E. A.; Pierce, F. W., 1991, Stratigraphic cross section showing upper Paleocene coal-bearing rocks of the Tongue River member of the Fort Union Formation in the Coal Bank Draw and Dugout Creek North quadrangles, Converse County, southeastern Powder River basin, Wyoming: IMAP 2013, 1 section ;sheet 73 x 102 cm., folded in envelope 30 x 24 cm.,
- Johnson, R. C.; Johnson, S. Y., 1991, Stratigraphic and time-stratigraphic cross sections of phanerozoic rocks along line B-B‘, Uinta and Piceance basin area, west-central Uinta basin, Utah to eastern Piceance basin, Colorado: IMAP 2184-B, 2 sections :col. ;sheets 100 x 109 cm. and 76 x 96 cm., folded in envelope 30 x 24 cm.,
- Johnson, S. Y.; Johnson, R. C., 1991, Stratigraphic and time-stratigraphic cross sections of phanerozoic rocks along line A-A‘, Uinta and Piceance basin area-Eagle basin, Colorado, to eastern basin and range area, Utah: IMAP 2184-A, 2 sections :col. ;sheets 102 x 146 cm. and 96 x 144 cm., folded in envelope 30 x 24 cm.,
- Klein, D. P.; Kucks, R. P., 1991, Gravity and aeromagnetic anomaly maps of the Ajo and Lukeville 1 degree by 2 degrees quadrangles, southwestern Arizona: IMAP 2139, 3 maps :col. ;sheets 81 x 107 cm. and 73 x 104 cm., folded in envelope 30 x 24 cm.,
- Koteff, Carl, 1991, Surficial geologic map of parts of the Rochester and Somersworth quadrangles, Strafford County, New Hampshire: IMAP 2265, 1 map :col. ;on sheet 84 x 79 cm., folded in envelope 30 x 24 cm.,
- Madden, D. J., 1991, Geochemical maps showing distribution of anomalously abundant elements in stream-sediment and glacial-moraine samples from the Anchorage 1 degree x 3 degrees Quadrangle, southern Alaska: IMAP 1976, 2 maps on 1 sheet :col. ;45 x 65 cm., on sheet 104 x 142 cm., folded in envelope 30 x 24 cm.,
- Madden, D. J., 1991, Geochemical maps showing distribution of anomalously abundant elements in the nonmagnetic, heavy-mineral-concentrate fraction of stream sediment from the Anchorage 1 degree x 3 degrees Quadrangle, southern Alaska: IMAP 1977, 2 maps on 1 sheet :col. ;45 x 65 cm., on sheet 106 x 142 cm., folded in envelope 30 x 24 cm.,
- Madole, R. F., 1991, Surficial geologic map of the Walden 30‘ x 60‘ Quadrangle, Jackson, Larimer, and Routt counties, Colorado: IMAP 1824, 1 map :col. ;55 x 84 cm., on sheet 79 x 142 cm., folded in envelope 30 x 24 cm.,
- Madole, R. F., 1991, Surficial geologic map of the Steamboat Springs 30‘ x 60‘ Quadrangle, Grand, Jackson, and Routt counties, Colorado: IMAP 1825, 1 map :col. ;55 x 85 cm., on sheet 78 x 142 cm., folded in envelope 30 x 24 cm.,
- Maldonado, Florian; Schmidt, D. L., 1991, Geologic map of the southern Sheep Range, Fossil Ridge, and Castle Rock area, Clark County, Nevada: IMAP 2086, 1 map :col. ;58 x 76 cm., on sheet 80 x 112 cm., folded in envelope 30 x 24 cm.,
- Marchand, D. E.; Crowl, G. H., 1991, Surficial geologic map of parts of Union and Snyder counties, Pennsylvania: IMAP 2051, 1 map :col. ;sheet 84 x 112 cm., folded in envelope 30 x 24 cm.,
- Maughan, E. K.; Lemke, R. W., 1991, Geologic map of the Portage Quadrangle, Cascade and Choteau counties, Montana: IMAP 2196, 1 map :col. ;88 x 59 cm., on sheet 102 x 86 cm., folded in envelope 30 x 24 cm.,
- McBride, R. A.; Jaffe, B. E.; Williams, S. J.; Sallenger, A. H., Jr.; Westphal, K. A., 1991, Shoreline changes of the Isles Dernieres barrier island arc, Louisiana, from 1853 to 1989: IMAP 2186, 7 maps on 1 sheet :col. ;15 x 63 cm., sheet 127 x 97 cm., folded in envelope 30 x 24 cm.,
- McLellan, M. W., 1991, Cross section showing the reconstructed stratigraphic framework of Paleocene rocks and coal beds in the central Powder River basin from Decker to Bear Skull Mountain, Montana: IMAP 1959-E, 1 section :col. ;sheet 61 x 72 cm., folded in envelope 30 x 24 cm.,
- McLellan, M. W.; Olive, W. W., 1991, Geologic map of the Elk Ridge Quadrangle, Powder River County, Montana: IMAP 2140, 1 map :col. ;58 x 41 cm., on sheet 71 x 81 cm., folded in envelope 30 x 24 cm.,
- McLellan, M. W.; Olive, W. W., 1991, Geologic map of the Samuelson Ranch Quadrangle, Powder River County, Montana: IMAP 2141, 1 map :col. ;58 x 41 cm., on sheet 71 x 81 cm., folded in envelope 30 x 24 cm.,
- McLellan, M. W.; Olive, W. W., 1991, Geologic map of the Home Creek Butte Quadrangle, Powder River County, Montana: IMAP 2142, 1 map :col. ;58 x 41 cm., on sheet 71 x 81 cm., folded in envelope 30 x 24 cm.,
- McLellan, M. W.; Olive, W. W., 1991, Geologic map of the Stacey Quadrangle, Powder River County, Montana: IMAP 2143, 1 map :col. ;58 x 41 cm., on sheet 71 x 91 cm., folded in envelope 30 x 24 cm.,
- Middendorf, M. A.; Thomson, K. C.; Easson, G. L.; Sumner, H. S., 1991, Bedrock geologic map of the Springfield 1 degree by 2 degrees Quadrangle, Missouri: IMAP 2029, 1 map :col. ;44 x 71 cm., on sheet 76 x 102 cm., folded in envelope 30 x 24 cm.,
- Millgate, M. L., 1991, Geologic map of the Twin Buttes Quadrangle, McKinley County, New Mexico: IMAP 2278, 1 map :col. ;57 x 47 cm., on sheet 71 x 96 cm., folded in envelope 30 x 24 cm.,
- Moore, R. B., 1991, Geologic map of Sao Miguel, Azores: IMAP 2007, 1 map :col. ;48 x 128 cm., on sheet 106 x 147 cm., folded in envelope 30 x 24 cm.,
- Moore, R. B.; Clague, D. A., 1991, Geologic map of Hualalai Volcano, Hawaii: IMAP 2213, 2 maps on 1 sheet :col. ;83 x 79 cm. and 57 x 51 cm., sheet 94 x 137 cm., folded in envelope 30 x 24 cm. +1 sheet (99 x 142 cm.),
- Moore, R. B.; Trusdell, F. A., 1991, Geologic map of the lower east rift zone of Kilauea Volcano, Hawaii: IMAP 2225, 1 map :col. ;115 x 86 cm., on sheet 146 x 106 cm., folded in envelope 30 x 24 cm.,
- Morris, E. C.; Masursky, Harold, Applebee, D. J.; Strobell, M. E., 1991, Geologic maps of science study area 3, Olympus Rupes, Mars: IMAP 2001, 2 remote sensing images :1 col. ;60 x 60 cm., on sheets 93 x 112 cm. and 76 x 142 cm., folded in envelope 30 x 24 cm.,
- Mudge, M. R.; Earhart, R. L., 1991, Bedrock geologic map of part of the disturbed belt south and east of Glacier National Park, Montana: IMAP 2130, 1 map :col. ;58 x 58 cm., on sheet 84 x 99 cm., folded in envelope 30 x 24 cm.,
- Mudge, M. R.; Earhart, R. L., 1991, Geologic map of the Bob Marshall and Great Bear Wildernesses and adjacent study areas, Montana: IMAP 2181, 1 map :col. ;133 x 85 cm., on sheet 147 x 104 cm, folded in envelope 30 x 24 cm.,
- Pearson, R. C.; Loen, J. S.; Trautwein, C. M.; Ruppel, E. T.; Moll, S. H., 1991, Map showing mineral resource assessment for placer gold and silver, Dillon 1 degree by 2 degrees Quadrangle, Idaho and Montana: IMAP 1803-F, 2 maps on 1 sheet :col. ;44 x 63 cm., sheet 105 x 132 cm., folded in envelope 30 x 24 cm.,
- Pierce, F. W.; Johnson, E. A., 1991, Stratigraphic cross section showing upper Paleocene coal-bearing rocks of the Tongue River member of the Fort Union Formation in the Piney Canyon NE and Piney Canyon NW quadrangles, Campbell and Weston counties, southeastern Powder River basin, Wyoming: IMAP 2011, 1 section ;sheet 81 x 109 cm., folded in envelope 30 x 24 cm.,
- Reheis, M. C., 1991, Geologic map of late Cenozoic deposits and faults in the western part of the Rhyolite Ridge 15‘ Quadrangle, Esmeralda County, Nevada: IMAP 2183, 1 map :col. ;115 x 48 cm., on sheet 127 x 81 cm., folded in envelope 30 x 24 cm.,
- Robbins, S. L., 1991, Complete Bouguer anomaly gravity map of the Buffalo 30‘ x 60‘ Quadrangle, Johnson and Campbell counties, Wyoming: IMAP 1923-B, 1 map :col. ;56 x 80 cm., on sheet 80 x 103 cm., folded in envelope 30 x 24 cm.,
- Roehler, H. W., 1991, Correlation and oil-shale assays of measured sections of the LaClede bed of the Laney Member of the Green River Formation in outcrops along the western margins of Washakie Basin, Wyoming, and Sand Wash Basin, Colorado: IMAP 2211, 1 section ;sheet 81 x 102 cm., folded in envelope 30 x 24 cm. +1 sheet (81 x 107 cm.),
- Roehler, H. W., 1991, Correlation and depositional analysis of oil shale and associated rocks in the Eocene Green River Formation, greater Green River basin, southwest Wyoming: IMAP 2226, 18 sections on 2 sheets ;sheets 106 x 133 cm. and 106 x 117 cm., folded in envelope 30 x 24 cm.,
- Ryder, R. T., 1991, Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Richland County, Ohio to Rockingham County, Virginia: IMAP 2264, 1 section :col. ;on sheet 86 x 114 cm.,
- Schultz, Art; Bartholomew, M. J.; Lewis, S. E., 1991, Map showing surficial and generalized bedrock geology and accompanying side-looking airborne radar image of the Radford 30‘ x 60‘ Quadrangle, Virginia and West Virginia: IMAP 2170-A, 2 maps :1 col. ;55 x 89 cm., on sheet 101 x 137 cm. and 71 x 96 cm., folded in envelope 30 x 24 cm.,
- Scott, D. H.; Chapman, M. G., 1991, Geologic map of science study area 6, Memnonia region of Mars: IMAP 2084, 1 map :col. ;61 x 60 cm., on sheet 104 x 117 cm., folded in envelope 30 x 24 cm.,
- Sharp, W. N., 1991, Petrochemistry of igneous rocks, Silver City 1 degree by 2 degrees Quadrangle, New Mexico and Arizona: IMAP 1310-H, 1 map :col. ;44 x 75 cm., on sheet 81 x 127 cm., folded in envelope +1 sheet (81 x 122 cm.) + 1 pamphlet (7 p. ; 28 cm.),
- Sherrod, D. R., 1991, Geologic map of a part of the Cascade Range between latitudes 43 degrees -44 degrees, central Oregon: IMAP 1891, 1 map :col. ;89 x 33 cm., on sheet 104 x 81 cm., folded in envelope 30 x 24 cm. +1 pamphlet (14 p. ; 28 cm.),
- State compilations by Gray, Henry Hamilton; Bleuer, N. K.; Linebacker, J. A.; Swadley, W. C.; Richmond, Gerald Martin; Miller, R. A.; Goldthwait, R. P.; Ward, R. A.; edited and integrated by Richmond, Gerald Martin; Fullerton, David S.; Digital edition by Bush, Charles A, 1991, Quaternary geologic map of the Louisville 4 degree x 6 degree quadrangle, United States: IMAP 1420(NJ-16), 18 p.; Map: 1 Sheet: 55 x 38 inches ; Downloads Directory,
- State compilations by Hartshorn, Joseph H.; Thompson, W. B.; Chapman, W. F.; Black, R. F.; Richmond, Gerald Martin; Grant, D. R.; Fullerton, David S.; edited and integrated by Richmond, Gerald Martin; Fullerton, David S., 1991, Quaternary geologic map of the Boston 4 degrees x 6 degrees quadrangle, United States and Canada: IMAP 1420(NK-19), 1 map :col.; approx. 54 x 29 in. [44 x 50 cm.], on sheet 76 x 137 cm., folded in envelope 30 x 24 cm.,
- State compilations by Howard, Alan D.; Behling, Robert E.; Wheeler, Walter H.; Daniels, Raymond B.; Swadley, W.C.; Richmond, Gerald M.; Goldthwait, Richard P.; Fullerton, David S.; Sevon, William D.; Miller, Robert A.; Edited and integrated by Richmond, Gerald M.; Fullerton, David S; Christiansen, Ann Coe; Digital edition by Bush, Charles A., 1991, Quaternary geologic map of the Blue Ridge 4 degrees x 6 degrees quadrangle, United States: U.S. Geological Survey IMAP 1420(NJ-17), Map: 54.42 inches X 31.49 inches; Map text: 19 p.; Downloads Directory,
- Thelin, G. P.; Pike, R. J., 1991, Landforms of the conterminous United States: a digital shaded-relief portrayal: IMAP 2206, 1 sheet,
- Trias, J. L., 1991, Marine geologic map of the Puerto Rico insular shelf Guanica to Ponce area: IMAP 2263, 1 map :col. ;40 x 66 cm. on sheet 86 x 114 cm.,
- Tripp, R. B.; Madden, D. J., 1991, Mineralogical maps showing distribution of ore-related minerals in the nonmagnetic, heavy-mineral-concentrate fraction of stream sediment from the Anchorage 1 degree x 3 degrees Quadrangle, southern Alaska: IMAP 1975, 2 maps on 1 sheet :col. ;45 x 65 cm., on sheet 107 x 117 cm., folded in envelope 30 x 24 cm.,
- Watts, K. C., 1991, Isopleth maps showing regional variations in pH of stream water and ground water in relation to geologic setting and known mineral deposits, Glens Falls 1 degree by 2 degrees Quadrangle, New York, Vermont, and New Hampshire: IMAP 2161-A, 3 maps on 1 sheet :2 col. ;22 x 32 cm., sheet 86 x 112 cm., folded in envelope 30 x 24 cm.,
- Whitford-Stark, J. L.; Mouginis-Mark, P. J.; Head, J. W., 1991, Geologic map of the Lerna region (Ji-4) of Io: IMAP 2055, 1 map :col. ;60 cm. diam., on sheet 94 x 102 cm., folded in envelope 30 x 24 cm.,
- Williams, P. L.; Covington, H. R.; Mytton, J. W., 1991, Geologic map of the Stricker 2 Quadrangle, Twin Falls and Cassia counties, Idaho: IMAP 2146, 1 map :col. ;58 x 43 cm., on sheet 71 x 71 cm., folded in envelope 30 x 24 cm.,
- Witbeck, N. E.; Tanaka, K. L.; Scott, D. H., 1991, Geologic map of the Valles Marineris region, Mars: IMAP 2010, 2 remote-sensing images :col. ;39 x 118 cm. and 53 x 118 cm., on sheets 101 x 127 cm. and 103 x 127 cm., folded in envelope 30 x 24 cm.,
- Witkind, I. J.; Weiss, M. P., 1991, Geologic map of the Nephi 30‘ x 60‘ Quadrangle, Carbon, Emery, Juab, Sanpete, Utah and Wasatch counties, Utah: IMAP 1937, 1 map :col. ;56 x 86 cm., on sheet 105 x 140 cm., folded in envelope 30 x 24 cm. +1 pamphlet (16 p. ; 28 cm.),
- Young, E. J., 1991, Geologic map of the East Portal Quadrangle, Boulder, Gilpin, and Grand counties, Colorado: IMAP 2212, 1 map :col. ;58 x 44 cm., on sheet 76 x 81 cm., folded in envelope 30 x 24 cm.,
