- Armstrong, B. R.; Carrara, P. E., 1981, Map of snow avalanche areas and known accident sites in the Telluride region, San Miguel County, Colorado: IMAP 1316, 1 map :col. ;63 x 55 cm. on sheet 79 x 136 cm.,
- Bacon, C. R., 1981, Geologic map of the Coso volcanic field and adjacent areas, Inyo County, California: IMAP 1200, 1 map :col. ;100 x 98 cm.,
- Beach, D. K.; Trumbull, J. V., 1981, Marine geologic map of the Puerto Rico insular shelf, Isla Caja de Muertos area: IMAP 1265, 1 map :col. ;69 x 66 cm.,
- Berryhill, H. L., Jr., 1981, Map showing paleogeography of the continental shelf during the low stand of sea level, Wisconsin glaciation, Corpus Christi 1 degree by 2 degrees Quadrangle, Texas: IMAP 1287-E, 1 map :col. ;47 x 82 cm.,
- Berryhill, H. L., Jr., 1981, Map showing paleogeography of the continental shelf during the low stand of sea level, Wisconsin glacial epoch, Beeville 1 degree by 2 degrees Quadrangle, Texas: IMAP 1288-E, 1 map :col. ;47 x 81 cm.,
- Berryhill, H. L., Jr.; Trippet, A. R., 1981, Map showing trace-metal content and texture of surficial bottom sediments in the Corpus Christi 1 degree by 2 degrees Quadrangle, Texas: IMAP 1287-B, 1 map :col. ;47 x 82 cm.,
- Berryhill, H. L., Jr.; Trippet, A. R., 1981, Map showing post-Wisconsin sedimentation patterns and faulting in the Corpus Christi 1 degree by 2 degrees Quadrangle, Texas: IMAP 1287-D, 1 map :col. ;47 x 82 cm.,
- Bobyarchick, A. R.; Pavlides, Louis; Wier, Karen, 1981, Piedmont geology of the Ladysmith and Lake Anna East quadrangles, and vicinity, Virginia: IMAP 1282, 1 map :col. ;58 x 97 cm.,
- Bryant, Bruce; McGrew, L. W.; Wobus, R. A., 1981, Geologic map of the Denver 1 degree by 2 degrees Quadrangle, north-central Colorado: IMAP 1163, 2 maps :col. ;45 x 70 cm. on 2 sheets, 92 x 141 cm. and 61 x 89 cm.,
- compiled by Berryhill, H. L., Jr.; Trippet, A. R., 1981, Map showing water circulation and rates of sedimentation in the Corpus Christi 1 degree by 2 degrees Quadrangle, Texas: IMAP 1287-A, 1 map :col. ;47 x 82 cm.,
- compiled by Berryhill, H. L., Jr.; Trippet, A. R., 1981, Map showing nature of shallow subsurface sediments and biogeology in the Corpus Christi 1 degree by 2 degrees Quadrangle, Texas: IMAP 1287-C, 1 map :col. ;47 x 82 cm.,
- compiled by Berryhill, H. L., Jr.; Trippet, A. R., 1981, Map showing water circulation and rates of sedimentation in the Beeville 1 degree by 2 degrees Quadrangle, Texas: IMAP 1288-A, 1 map :col. ;47 x 81 cm.,
- compiled by Berryhill, H. L., Jr.; Trippet, A. R., 1981, Map showing trace-metal content and texture of surficial bottom sediments in the Beeville 1 degree by 2 degrees Quadrangle, Texas: IMAP 1288-B, 1 map :col. ;47 x 81 cm.,
- compiled by Berryhill, H. L., Jr.; Trippet, A. R., 1981, Map showing nature of shallow subsurface sediments and biogeology in the Beeville 1 degree by 2 degrees Quadrangle, Texas: IMAP 1288-C, 1 map :col. ;47 x 81 cm.,
- compiled by Berryhill, H. L., Jr.; Trippet, A. R., 1981, Map showing post-Wisconsin sedimentation patterns and faulting in the Beeville 1 degree by 2 degrees Quadrangle, Texas: IMAP 1288-D, 1 map :col. ;47 x 81 cm.,
- compiled by Trippet, A. R.; Berryhill, H. L., Jr., 1981, Map showing structure of the continental terrace in the corpus Christi 1 degree by 2 degrees Quadrangle, Texas: IMAP 1287-F, 1 map :col. ;47 x 82 cm.,
- compiled by Trippet, A. R.; Berryhill, H. L., Jr., 1981, Map showing structure of the continental terrace in the Beeville 1 degree by 2 degrees Quadrangle, Texas: IMAP 1288-F, 1 map :col. ;46 x 81 cm.,
- Crist, M. A., 1981, Generalized fence diagram showing stratigraphy and potentiometric surface of the Tertiary formations in southeastern Wyoming and an adjacent part of Colorado: IMAP 1308, 1 fence diagram ;57 x 80 cm., folded in envelope 30 x 24 cm.,
- Daniels, D. L.; Zietz, Isidore, 1981, Aeromagnetic map of the Charlotte 1 degree by 2 degrees Quadrangle, North Carolina and South Carolina: IMAP 1251-B, 1 map ;45 x 73 cm.,
- Daniels, D. L.; Zietz, Isidore, 1981, Aeromagnetic map of the Charlotte 1 degree by 2 degrees Quadrangle, North Carolina and South Carolina: IMAP 1251-C, 1 map :col. ;45 x 73 cm.,
- DeHon, R. A.; Scott, D. H.; Underwood, J. R., Jr., 1981, Geologic map of the Kuiper Quadrangle of Mercury: IMAP 1233, 1 map :col. ;44 x 61 cm.,
- Determan, R. L.; Miller, T. P.; Yount, M. E.; Wilson, F. H., 1981, Quaternary geologic map of the Chignik and Sutwik Island quadrangles, Alaska: IMAP 1292, 1 map :col. ;44 x 112 cm.,
- Detterman, R. L.; Miller, T. P., 1981, Geologic map of the Chignik and Sutwik Island quadrangles, Alaska: IMAP 1229, 1 map :col. ;44 x 114 cm.,
- Drewes, Harald, 1981, Geologic map and sections of the Bowie Mountain South Quadrangle, Cochise County, Arizona: IMAP 1363, 1 map :col. ;58 x 49 cm. on sheet 84 x 112 cm.,
- Drewes, Harald, 1981, Geologic map and sections of the Bowie Mountain North Quadrangle, Cochise County, Arizona: IMAP 1492, 1 map :col. ;58 x 49 cm., on sheet 84 x 112 cm.,
- Dunrud, C. R.; Nevins, B. B., 1981, Solution mining and subsidence in evaporite rocks in the United States: IMAP 1298, 1 map ;63 x 97 cm. +1 text on sheet 84 x 106 cm.,
- Ekren, E. B.; McIntyre, D. H.; Bennett, E. H.; Malde, H. E., 1981, Geologic map of Owyhee County, Idaho, west of longitude 116 degrees W.: IMAP 1256, 1 map :col. ;156 x 57 cm. on 2 sheets 80 x 87 cm. and 101 x 116 cm.,
- Fabiano, E. B.; Peddie, N. W., 1981, Magnetic declination in the United States; epoch 1980: IMAP 1283, 1 map :col. ;64 x 97 cm.,
- Fabiano, E. B.; Peddie, N. W., 1981, Magnetic total intensity in the United States; epoch 1980: IMAP 1370, 3 maps :col. ;65 x 95 cm. or smaller.,
- Foose, M. P., 1981, Geologic map of the Ned Lake Quadrangle, Iron and Baraga counties, Michigan: IMAP 1284, 1 map :col. ;44 x 31 cm. on sheet 81 x 109 cm.,
- Froelich, A. J.; Leavy, B. D., 1981, Map showing mineral resources of the Culpeper Basin, Virginia and Maryland availability and planning for future needs: IMAP 1313-B, 1 map :col. ;118 x 76 cm.,
- Fuller, H. K.; Williams, V. S.; Colton, R. B., 1981, Map showing areas of landsliding in the Kaiparowits coal-basin area, Utah: IMAP 1033-H, 1 map ;col. ;
89 x 71 cm.,
- Galyardt, G. L.; Rush, F. E., 1981, Geologic map of the Crater Springs Known Geothermal Resources Area and vicinity, Juab and Millard counties, Utah: IMAP 1297, 1 map :col. ;74 x 67 cm.,
- Geological Survey (U.S.), 1981, Synthetic natural color Landsat photomosaic of Nevada: IMAP 1219, 2 maps :col. ;80 x 55 cm.,
- Geological Survey (U.S.), 1981, Shaded relief map of the Coprates Northwest Quadrangle of Mars: IMAP 1295, 1 remote-sensing image :col. ;30 x 60 cm. on sheet 86 x 67 cm. folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1981, Altimetric and shaded relief map of Venus: IMAP 1324, 1 map :col. ;46 x 76 cm.,
- Geological Survey (U.S.), 1981, Shaded relief map of the lunar polar regions: IMAP 1326-A, 2 maps :col. ;57 cm. in diameter on sheet 75 x 121 cm.,
- Geological Survey (U.S.), 1981, Map showing relief and surface markings of the lunar polar regions: IMAP 1326-B, 2 maps :col. ;58 cm. in diameter on sheet 77 x 123 cm.,
- Geological Survey (U.S.), 1981, Energy resources map of New Mexico: IMAP 1327, 1 map :col. ;126 x 114 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Diacria Northwest Quadrangle of Mars: IMAP 1328, 1 map ;53 x 59 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Amazonis Northeast Quadrangle of Mars: IMAP 1331, 1 map ;44 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Amazonis Southwest Quadrangle of Mars: IMAP 1332, 1 map ;41 x 60 cm. on sheet 87 x 66 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Amazonis Southeast Quadrangle of Mars: IMAP 1333, 1 map ;41 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Amazonis Northwest Quadrangle of Mars: IMAP 1334, 1 map ;43 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Phaethontis Northeast Quadrangle of Mars: IMAP 1335, 1 map ;52 x 58 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Phaethontis North-central Quadrangle of Mars: IMAP 1336, 1 map ;52 x 59 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Oxia Palus Southeast Quadrangle of Mars: IMAP 1342, 1 map ;41 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Oxia Palus Southwest Quadrangle of Mars: IMAP 1343, 1 map ;41 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Oxia Palus Northeast Quadrangle of Mars: IMAP 1344, 1 map ;44 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Oxia Palus Northwest Quadrangle of Mars: IMAP 1345, 1 map ;44 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Mare Acidalium Northwest Quadrangle of Mars: IMAP 1347, 1 map ;53 x 60 cm. folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Mare Acidalium Northeast Quadrangle of Mars: IMAP 1348, 1 map ;53 x 59 cm. folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Mare Acidalium Southwest Quadrangle of Mars: IMAP 1349, 1 map ;53 x 60 cm. folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Mare Acidalium South-central Quadrangle of Mars: IMAP 1350, 1 map ;53 x 60 cm. folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Mare Acidalium Southeast Quadrangle of Mars: IMAP 1351, 1 map ;53 x 60 cm. folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Arcadia Southeast Quadrangle of Mars: IMAP 1352, 1 map ;52 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Arcadia Northeast Quadrangle of Mars: IMAP 1353, 1 map ;53 x 59 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Arcadia Southwest Quadrangle of Mars: IMAP 1354, 1 map ;53 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Arcadia Northwest Quadrangle of Mars: IMAP 1355, 1 map ;53 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Diacria South-central Quadrangle of Mars: IMAP 1356, 1 map ;53 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Diacria Southeast Quadrangle of Mars: IMAP 1357, 1 map ;52 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Diacria Southwest Quadrangle of Mars: IMAP 1358, 1 map ;52 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Diacria Northeast Quadrangle of Mars: IMAP 1359, 1 map ;53 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Sinus Sabaeus Northwest Quadrangle of Mars: IMAP 1376, 1 map ;41 x 60 cm. on sheet 87 x 67 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Sinus Sabaeus Northeast Quadrangle of Mars: IMAP 1377, 1 map ;41 x 60 cm. folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Olympus Mons region of Mars: IMAP 1379, 1 map ;107 x 78 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Margaritifer Sinus Northwest Quadrangle of Mars: IMAP 1381, 1 map ;40 x 60 cm. folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Margaritifer Sinus Northeast Quadrangle of Mars: IMAP 1382, 1 map ;41 x 60 cm. on sheet 87 x 67 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Elysium Southwest Quadrangle of Mars: IMAP 1384, 1 map ;41 x 60 cm. on sheet 87 x 67 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Elysium Northeast Quadrangle of Mars: IMAP 1385, 1 map ;44 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Elysium Northwest Quadrangle of Mars: IMAP 1386, 1 map ;44 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Elysium Southeast Quadrangle of Mars: IMAP 1387, 1 map ;41 x 60 cm. on sheet 87 x 67 cm.,
- Geological Survey (U.S.), 1981, Shaded relief map of the Diacria Quadrangle of Mars: IMAP 1392, 1 map ;48 x 69 cm. folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Noachis Southeast quadrangle of Mars: IMAP 1393, 1 map ; 25 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Noachis North-central Quadrangle of Mars: IMAP 1394, 1 map ;52 x 59 cm. folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Noachis Northwest Quadrangle of Mars: IMAP 1395, 1 map ;52 x 59 cm. folded in envelope 30 x 24 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Noachis Northeast Quadrangle of Mars: IMAP 1396, 1 map ;52 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Cebrenia Northeast Quadrangle of Mars: IMAP 1397, 1 map ; 54 x 60 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Cebrenia South-Central Quadrangle of Mars: IMAP 1398, 1 map ; 52 x 59 cm.,
- Geological Survey (U.S.), 1981, Controlled photomosaic of the Cebrenia Southeast Quadrangle of Mars: IMAP 1399, 1 map ;53 x 60 cm.,
- Godson, R. H., 1981, Digital terrain map of the United States: IMAP 1318, 1 map :col. ;44 x 80 cm.,
- Greenberg, Jonathan; Hart, P. E.; Grantz, Arthur, 1981, Bathymetric map of the continental shelf, slope, and rise of the Beaufort Sea north of Alaska: IMAP 1182-A, 1 map :col. ;94 x 140 cm. +text (6 p. ; 28 cm.),
- Harwood, D. S.; Helley, E. J.; Doukas, M. P., 1981, Geologic map of the Chico monocline and northwestern part of the Sacramento Valley, California: IMAP 1238, 1 map :col. ;119 x 103 cm.,
- Lewis, B. D.; Hotchkiss, W. R., 1981, Thickness, percent sand, and configuration of shallow hydrogeologic units in the Powder River basin, Montana and Wyoming: IMAP 1317, 16 maps :col. ;51 x 32 cm. on 6 sheets 70 x 108 cm. folded in envelope 30 x 24 cm.,
- Luedke, R. G.; Burbank, W. S., 1981, Geologic map of the Uncompahgre (Ouray) mining district, southwestern Colorado: IMAP 1247, 1 map :col. ;76 x 61 cm.,
- Luedke, R. G.; Smith, R. L., 1981, Map showing distribution, composition, and age of late Cenozoic volcanic centers in California and Nevada: IMAP 1091-C, 1 map :col. ;119 x 102 cm. ++ 1 sheet 138 x 97 cm.,
- Morris, E. C.; Howard, K. A., 1981, Geologic map of the Diacria Quadrangle of Mars: IMAP 1286, 1 map :col. ;48 x 70 cm. folded in envelope 30 x 24 cm.,
- Morsches, S. A.; Zenone, Chester, 1981, Index map of flood studies, Culpeper Basin, Virginia and Maryland: IMAP 1313-A, 1 map :col. ;15 x 76 cm.,
- Myrick, R. M.; Aldridge, B. N., 1981, Delineation of flood hazards in the Jaynes Quadrangle, Pima County, Arizona: IMAP 843-D, 1 map :col. ;57 x 49 cm. on sheet 71 x 107 cm.,
- O'Neill, J. M., 1981, Geologic map of the Mount Richthofen Quadrangle and the western part of the Fall River Pass Quadrangle, Grand and Jackson counties, Colorado: IMAP 1291, 1 map :col. ;58 x 59 cm.,
- Price, Don, 1981, Map showing general chemical quality of ground water in the Alton-Kolob coal-fields area, Utah: IMAP 1235-B, 1 map :col. ;89 x 100 cm.,
- Price, Don, 1981, Surface-water resources in the Tooele 2 degrees Quadrangle, Utah: IMAP 1245, 1 map :col. ;145 x 68 cm. folded in envelope 30 x 24 cm.,
- Price, Don, 1981, Summary appraisal of water resources in the Redmond Quadrangle, Sanpete and Sevier counties, Utah: IMAP 1304-B, 1 map :col. ;58 x 45 cm.,
- Price, Don, 1981, Map showing general chemical quality of ground water in the Richfield Quadrangle, Utah: IMAP 1374, 1 map :col. ;44 x 70 cm.,
- Prinz, W. C., 1981, Geologic map of the Gogebic Range-Watersmeet area, Gogebic and Ontonagon counties, Michigan: IMAP 1365, 1 map :col. ;36 x 75 cm.,
- Richter, D. H.; Shafiqullah, M.; Lawrence, V. A., 1981, Geologic map of the Whitlock Mountains and vicinity, Graham County, Arizona: IMAP 1302, 1 map :col. ;57 x 49 cm.,
- Scott, D. H., 1981, Map showing lava flows in the southeast part of the Phoenicis Lacus Quadrangle of Mars: IMAP 1274, 1 map :col. ;43 x 60 cm. folded in envelope 30 x 24 cm.,
- Scott, D. H.; Schaber, G. G., 1981, Map showing lava flows in the northeast part of the Memnonia Quadrangle of Mars: IMAP 1270, 1 map :col. ;40 x 60 cm. on sheet folded in envelope 30 x 24 cm.,
- Scott, D. H.; Schaber, G. G.; Dial, A. L., Jr., 1981, Map showing lava flows in the southwest part of the Phoenicis Lacus Quadrangle of Mars: IMAP 1275, 1 map :col. ;43 x 59 cm. folded in envelope 30 x 24 cm.,
- Scott, D. H.; Schaber, G. G.; Horstman, K. C.; Dial, A. L., Jr., 1981, Map showing lava flows in the northeast part of the Tharsis Quadrangle of Mars: IMAP 1267, 1 map :col. ;43 x 59 cm. folded in envelope 30 x 24 cm.,
- Scott, D. H.; Schaber, G. G.; Horstman, K. C.; Dial, A. L., Jr.; Tanaka, K. L., 1981, Map showing lava flows in the northwest part of the Tharsis Quadrangle of Mars: IMAP 1266, 1 map :col. ;42 x 59 cm., on sheet 81 x 86 cm., folded in envelope 30 x 24 cm.,
- Scott, D. H.; Schaber, G. G.; Horstman, K. C.; Dial, A. L., Jr.; Tanaka, K. L., 1981, Map showing lava flows in the southwest part of the Tharsis Quadrangle of Mars: IMAP 1268, 1 map :col. ;40 x 59 cm. folded in envelope 30 x 24 cm.,
- Scott, D. H.; Schaber, G. G.; Horstman, K. C.; Dial, A. L., Jr.; Tanaka, K. L., 1981, Map showing lava flows in the southeast part of the Memnonia Quadrangle of Mars: IMAP 1271, 1 map :col. ;43 x 59 cm. folded in envelope 30 x 24 cm.,
- Scott, D. H.; Schaber, G. G.; Horstman, K. C.; Dial, A. L., Jr.; Tanaka, K. L., 1981, Map showing lava flows in the northwest part of the Phoenicis Lacus Quadrangle of Mars: IMAP 1272, 1 map :col. ;40 x 59 cm. folded in envelope 30 x 24 cm.,
- Scott, D. H.; Schaber, G. G.; Tanaka, K. L., 1981, Map showing lava flows in the southeast part of the Tharsis Quadrangle of Mars: IMAP 1269, 1 map ;40 x 59 cm. on sheet 81 x 87 cm. folded in envelope 30 x 24 cm.,
- Scott, D. H.; Tanaka, K. L., 1981, Map showing lava flows in the northwest part of the Thaumasia Quadrangle of Mars: IMAP 1273, 1 map :col. ;52 x 58 cm. folded in envelope 30 x 24 cm.,
- Scott, D. H.; Tanaka, K. L., 1981, Map showing lava flows in the northeast part of the Phoenicis Lacus Quadrangle of Mars: IMAP 1277, 1 map :col. ;40 x 59 cm. folded in envelope 30 x 24 cm.,
- Scott, D. H.; Tanaka, K. L., 1981, Map showing lava flows in the northeast part of the Amazonia Quadrangle of Mars: IMAP 1279, 1 map :col. ;43 x 60 cm. folded in envelope 30 x 24 cm.,
- Scott, D. H.; Tanaka, K. L., 1981, Map showing lava flows in the southeast part of the Amazonis Quadrangle of Mars: IMAP 1280, 1 map :col. ;40 x 59 cm. folded in envelope 30 x 24 cm.,
- Scott, D. H.; Tanaka, K. L., 1981, Map showing lava flows in the northeast part of the Phaethontis Quadrangle of Mars: IMAP 1281, 1 map :col. ;51 x 58 cm. folded in envelope 30 x 24 cm.,
- Scott, D. H.; Tanaka, K. L.; Schaber, G. G., 1981, Map showing lava flows in the southeast part of the Diacria Quadrangle of Mars: IMAP 1276, 1 map :col. ;51 x 78 cm. folded in envelope 30 x 24 cm.,
- Scott, D. H.; Tanaka, K. L.; Schaber, G. G., 1981, Map showing lava flows in the southwest part of the Arcadia Quadrangle of Mars: IMAP 1278, 1 map :col. ;51 x 79 cm.,
- Seiders, V. M., 1981, Geologic map of the Asheboro, North Carolina, and adjacent areas: IMAP 1314, 1 map :col. ;52 x 36 cm.,
- Seiders, V. M.; Mixon, R. B., 1981, Geologic map of the Occoquan Quadrangle and part of the Fort Belvoir Quadrangle, Prince William and Fairfax counties, Virginia: IMAP 1175, 1 map :col. ;58 x 90 cm.,
- Thorman, C. H.; Drewes, Harald, 1981, Geologic map of the Gage SW quadrangle, Grant and Luna counties, New Mexico: IMAP 1231, 1 map :col. ;57 x 49 cm.,
- Van Horn, R., 1981, Geologic map of Pre-Quaternary rocks of the Salt Lake City North Quadrangle, Davis and Salt Lake counties, Utah: IMAP 1330, 1 map :col. ;58 x 44 cm.,
- Whitney, J. W., 1981, Surficial geologic map of the Grand Junction 1 degree by 2 degrees Quadrangle, Colorado and Utah: IMAP 1289, 1 map :col. ;45 x 70 cm.,
- Witkind, I. J., 1981, Reconnaissance geologic map of the Redmond Quadrangle, Sanpete and Sevier counties, Utah: IMAP 1304-A, 1 map :col. ;58 x 45 cm.,
- Wood, G. H., Jr., 1981, Geologic map of anthracite-bearing rocks in the Nesquehoning Quadrangle, Carbon County, Pennsylvania: IMAP 1255, 1 map :col. ;56 x 88 cm. on sheet 107 x 117 cm.,
- Wynn, J. C., 1981, Complete Bouguer gravity anomaly map of the Silver City 1 degree x 2 degrees Quadrangle, New Mexico-Arizona: IMAP 1310-A, 1 map :col. ;45 x 76 cm.,
