- Barovich, Karin M.; Patchett, P. Jonathan; Peterman, Zell E.; Sims, P. K.; Day, Warren C., 1991, Neodymium isotopic evidence for early Proterozoic units in the Watersmeet gneiss dome, northern Michigan. Temperature-pressure estimates of dynamically recrystallized rocks in the early Proterozoic Mountain shear zone, northeastern Wisconsin: Bulletin 1904-G,H, p. 23, illus. incl. geol. sketch maps; p. G1-G7, H1-H16,
- Beck, J. Warren; Murthy, V. Rama; edited by Sims, P. K.; Carter, L. M. H., 1991, Evidence for continental crustal assimilation in the Hemlock Formation flood basalts of the early Proterozoic Penokean Orogen, Lake Superior region: Bulletin 1904-I, p. I1-I25, illus. incl. 4 tables, geol. sketch map, 86 refs,
- Bell, Henry, III; Bush, Alfred L.; Turner, Robert L.; Cady, John W.; Brown, S. Don; Hannigan, Brian J., 1991, Mineral resources of the Paria-Hackberry Wilderness Study Area, Kane County, Utah: Bulletin 1748-B, p. B1-B17; 1 plate in pocket,
- Bonilla, Manuel G.; Lienkaemper, James J., 1991, Factors affecting the recognition of faults exposed in exploratory trenches: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Bulletin 1947, v, 54 p. ill. ;28 cm.,
- Brem, G. F.; John, D. A.; Nash, J. T.; Poole, F. G.; Snyder, D. B., 1991, Mineral resources of the Arc Dome Wilderness Recommendation Area, Nye County, Nevada: U.S. G.P.O., Bulletin 1961, vi, 21 p. ill., map (part col.) ;28 cm.,
- Brogan, George E.; Kellogg, K. S.; Slemmons, D. B.; Terhune, C. L., 1991, Late Quaternary faulting along the Death Valley-Furnace Creek fault system, California and Nevada: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Bulletin 1991, iv, 23 p. ill., maps (some col.) ;28 cm.,
- Bultman, Mark W., 1991, Quantitative mineral resource assessment of selected mineral deposits in the Challis National Forest, Idaho: U.S. G.P.O., Bulletin 1987, iv, 25 p. ill. ;28 cm.,
- Caddey, Stanton W.; Bachman, Richard L.; Campbell, Thomas J.; Reid, Rolland R.; Otto, Robert P., 1991, The Homestake gold mine, an early Proterozoic iron-formation-hosted gold deposit, Lawrence County, South Dakota: Bulletin 1857-J, p. J1-J67, illus. incl. 9 tables, sects., geol. sketch maps,
- Cathcart, James Bachelder; Botinelly, Theodore, 1991, Mineralogy and chemistry of samples from a drill hole in the southern extension of the land-pebble phosphate district, Florida: U.S. G.P.O. ; Books and Open-file reports section, U.S. Geological Survey [distributor], Bulletin 1978, iv, 25 p. ill. ;28 cm.,
- Cavaroc, V. V.; Flores, Romeo M., 1991, Red beds of the Triassic Chugwater Group, southwestern Powder River basin, Wyoming: Bulletin 1917-E, p. E1-E17, illus. incl. 1 table, sects., strat. cols., geol. sketch map, 45 refs,
- DeWitt, Ed; Thorson, Jon P.; Smith, Robert C.; Whipple, James W.; Saunders, James A., 1991, Epithermal gold deposits; Part II: Bulletin 1857-I, p. I1-I48, illus. incl. geol. sketch maps,
- Dickinson, Kendell A., 1991, Uranium and diagenesis in evaporitic lacustrine mudstone of the Oligocene White River Group, Dawes County, Nebraska: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Bulletin 1956, iv, 25 p. ill., maps ;28 cm.,
- Dwyer, John L.; Nash, J. Thomas, 1991, Spatial analysis of geochemical and geologic information from the Tonopah 1 degree by 2 degrees quadrangle, Nevada: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Bulletin 1878, iv, 21 p. ill., maps (some col.) ;28 cm.,
- Dyman, T. S.; Haley, J. C.; Perry, W. J., Jr.; Tysdal, R. G.; Nichols, D. J.; Cobban, W. A., 1991, Contributions to Late Cretaceous stratigraphy and paleontology, western Montana: U.S. Geological Survey, Bulletin 1962, iii, 26 p. ill. ;28 cm.,
- Edited by Drake, Avery Ala, Jr., 1991, Contributions to New Jersey geology: U.S. G.P.O. ; Books and Open-File Reports Section [distributor], Bulletin 1952, 1 v. (various pagings) :ill., maps ;28 cm.,
- Edited by Gundersen, L. C. S.; Wanty, Richard B., 1991, Field studies of radon in rocks, soils, and water: U.S. Geological Survey ; U.S. G.P.O., Bulletin 1971, xxi, 334 p. ill. ;28 cm.,
- edited by Martin, James A.; Pratt, Walden P., 1991, Geology and mineral-resource assessment of the Springfield 1 degree x 2 degrees quadrangle, Missouri, as appraised in September 1985: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Bulletin 1942, vii, 115 p. :ill., maps ;28 cm.; 2 plates in pocket,
- Edited by Molnia, Carol L.; Jobin, D. A.; O'Connor, J. T.; Kottlowski, F. E., 1991, Coalfields of New Mexico; geology and resources: U.S. G.P.O. ; U.S. Geological Survey, Branch of Central Technical Reports, Bulletin 1972, vi, 77 p. ill. ;28 cm.,
- Edited by Sando, William Jasper, 1991, Shorter contributions to paleontology and stratigraphy: U.S. G.P.O. ; For sale by Books and Open-File Reports Section, U.S. Geological Survey, Bulletin 1934, 1 v. (various pagings) :ill. ;28 cm.,
- Edited by Sando, William Jasper, 1991, Shorter contributions to paleontology and stratigraphy: U.S. Geological Survey, Bulletin 1985, 1 v. (various pagings) :ill. ;28 cm.,
- Edited by Thorman, Charles H.; Ladeira, Eduardo A.; Schnabel, Diane C., 1991, Gold deposits related to greenstone belts in Brazil; deposit modeling workshop; Part A, excursions: U.S. G.P.O., Bulletin 1980-A, p. A1-A86, ill. ;28 cm.,
- Edited by Tuttle, M. L., 1991, Geochemical, biogeochemical, and sedimentological studies of the Green River Formation, Wyoming, Utah, and Colorado: U.S. G.P.O. ; For sale by Books and Open-File Reports Section [distributor], Bulletin 1973-A-G, 1 v. (various pagings) :ill. ;28 cm.,
- Englund, Kenneth John; Thomas, Roger E., 1991, Coal resources of Tazewell County, Virginia, 1980: Books and Open-File Reports Section, U.S. Geological Survey [distributor], Bulletin 1913, iv, 17 p. ill., maps ;28 cm.,
- Feist,Monique; Brouwers, Elisabeth M., 1991, A new Tolypella from the Ocean Point dinosaur locality, North Slope, Alaska, and the Late Cretaceous to Paleocene nitelloid charophytes: Bulletin 1990-F, p. F1-F7, illus. incl. 1 plate, 33 refs,
- Force, Eric R.; Cox, Leslie J., 1991, Manganese contents of some sedimentary rocks of Paleozoic age in Virginia: U.S. G.P.O., Bulletin 1916, 1 v. (various pagings) :ill. ;28 cm.,
- Frederiksen, Norman O., 1991, Pollen zonation and correlation of Maastrichtian marine beds and associated strata, Ocean Point dinosaur locality, North Slope, Alaska: Bulletin 1990-E, p. E1-E24, 2 tables, 7 plates, charts, sketch maps, 54 refs,
- Geological Survey (U.S.), 1991, Stratigraphic notes, 1989-90; Four short papers propose changes in stratigraphic nomenclature in Oregon, Vermont, Massachusetts, and southern Pakistan: U.S. G.P.O., Bulletin 1935, iii, 40 p. ill., maps ;28 cm.,
- Haley, J. Christopher; Perry, W. J., 1991, The Red Butte Conglomerate; a thrust-belt-derived conglomerate of the Beaverhead Group, southwestern Montana: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Bulletin 1945, iii, 19 p. ill., maps ;28 cm.,
- Hickling, N. L., 1991, A petrologic study of the Fox Hills Sandstone, Rock Springs Uplift, Wyoming: U.S. G.P.O. ; U.S. Geological Survey, Books and Open-File Reports Section [distributor], Bulletin 1919, iv, 15 p. ill., maps ;28 cm.,
- Houck, Karen J., 1991, Structural control on distribution of sedimentary facies in the Pennsylvanian Minturn Formation of north-central Colorado: Bulletin 1787-Y, p. Y1-Y33, illus. incl. strat. col., sect., block diag., sketch maps,
- John, David A., 1991, Evolution of hydrothermal fluids in the Alta Stock, central Wasatch Mountains, Utah: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Bulletin 1977, iv, 51 p. ill. ;28 cm.,
- Johnson, R. C.; Bornhorst, T. J.; edited by Sims, P. K.; Carter, L. M. H., 1991, Archean geology of the northern block of the Ishpeming greenstone belt, Marquette County, Michigan: Bulletin 1904-F, p. F1-F20, illus. incl. 2 tables, sects., geol. sketch maps, 34 refs,
- Klasner, John S.; Ojakangas, R. W.; Schulz, K. J.; LaBerge, G. L., 1991, Nature and style of deformation in the foreland of the early Proterozoic Penokean Orogen, northern Michigan: Bulletin 1904-K, p. K1-K22, illus. incl. 2 tables, sects., block diag., geol. sketch maps, 65 refs,
- LaBerge, Gene L.; Klasner, J. S.; Myers, Paul E., 1991, New observations on the age and structure of Proterozoic quartzites in Wisconsin: Bulletin 1904-B, p. B1-B18, illus. incl. 1 table, geol. sketch map, 57 refs,
- Lee, Myung W.; Agena, W. F., 1991, Linearized inversion of reflection traveltimes: U.S. G.P.O. ; Books and Open-File Reports Section, U.S. Geological Survey [distributor], Bulletin 1965, iii, 21 p. ill. ;28 cm.,
- Luttrell, Gwendolyn Lewise Werth; Hubert, Marilyn L.; Murdock, Cynthia R., 1991, Lexicon of new formal geologic names of the United States 1981-1985: U.S. G.P.O., Bulletin 1565, iv, 376 p. ;24 cm.,
- Matti, Jonathan C.; Carson, Scott E., 1991, Liquefaction susceptibility in the San Bernardino Valley and vicinity, Southern California; a regional evaluation: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Bulletin 1898, v, 53 p. ill., maps ;29 cm.,
- McCartan, Lucy; Gettings, M. E., 1991, Possible relationship between seismicity and warm intrusive bodies in the Charleston, South Carolina, and New Madrid, Missouri, areas: U.S. G.P.O., Bulletin 1953, iv, 18 p. ill. ;28 cm.,
- McCollum, Linda Busby; Miller, David M., 1991, Cambrian stratigraphy of the Wendover area, Utah and Nevada: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Bulletin 1948, iv, 43 p. ill., maps ;29 cm.,
- McLean, Hugh, 1991, Distribution and juxtaposition of Mesozoic lithotectonic elements in the basement of the Santa Maria Basin, California: Bulletin 1995-B, p. B1-B12, illus. incl. sketch maps, 37 refs,
- Miller, Ralph L.; Carey, Mary Alice; Thompson-Rizer, Carolyn L., 1991, Geology of the La Vida Mission Quadrangle, San Juan and McKinley counties, New Mexico: U.S. G.P.O. ; For Sale by the Books and Open-File Reports Section, U.S. Geological Survey, Bulletin 1940, vi, 64 p. ill., col. maps ;28 cm.,
- Molenaar, Cornelius M.; Cobban, William A., 1991, Middle Cretaceous stratigraphy on the south and east sides of the Uinta Basin, northeastern Utah and northwestern Colorado: Bulletin 1787-P, p. P1-P34, 1 plate in pocket,
- Moore, James Gregory, 1991, Marion Peak Quadrangle, Fresno County, California; analytic data: U.S. Dept. of the Interior, U.S. Geological Survey ; For sale by the Books and Open-File Reports Section [distributor], Bulletin 1986, iii, 23 p. ill., map ;28 cm.,
- Moore, Richard B., 1991, Geology of three late Quaternary stratovolcanoes on Sao Miguel, Azores: U.S. Geological Survey, Branch of Central Technical Reports, Bulletin 1900, iv, 46 p. ill., maps ;28 cm.,
- Nichols, K. M.; Silberling, N. J., 1991, Petrology and depositional setting of Mississippian rocks associated with an anoxic event at Samak, western Uinta Mountains, Utah. Petrology and significance of a Mississippian (Osagean-Meramecian) anoxic event, Lakeside Mountains, northwestern Utah: Bulletin 1787-S,T, p. S1-S13, T1-T12, illus. incl. sketch maps,
- Norton, Daniel R.; Friedman, Irving, 1991, Chloride flux and surface water discharge out of Yellowstone National Park, 1982-1989: U.S. Geological Survey, Branch of Central Technical Reports, Bulletin 1959, iv, 42 p. ill. ;28 cm.,
- Peper, John D.; Lesure, F. G.; Cox, L. J.; D'Agostino, J. P., 1991, Geology, geochemistry, and mineral resource assessment of the southern Nantahala Wilderness and adjacent roadless areas, Rabun and Towns counties, Georgia, and Clay and Macon counties, North Carolina: U.S. Geological Survey, Bulletin 1883, vi, 30 p. ill., maps ;28 cm.,
- Pollastro, Richard M., 1991, Composition, clay mineralogy, and diagenesis of the Simpson Group (Middle Ordovician), Grady County, Oklahoma: Bulletin 1866-H, p. H1-H19,
- Potter, Christopher J.; Tang, Rex L.; Hainsworth, Timothy J., 1991, Late Paleozoic structure of the southern part of the Uinta Basin, Utah, from seismic reflection data: Bulletin 1787-V, p. V1-V10; 1 plate in pocket,
- Pratt, Walden P.; Sims, P. K., 1991, The Midcontinent of the United States; permissive terrane for an olympic dam-type deposit?: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section [distributor], Bulletin 1932, iv, 81 p. ill. ;28 cm.,
- Roberts, Laura N., 1991, Coal resources of the Fruitland Formation in part of the Ute Mountain Ute Indian Reservation, San Juan County, New Mexico: U.S. G.P.O. ; U.S. Geological Survey, Books and Open-File Reports Section [distributor], Bulletin 1938, iv, 15 p. ill., maps ;28 cm.,
- Sheppard, Richard A., 1991, Zeolitic diagenesis of tuffs in the Miocene Chalk Hills Formation, western Snake River plain, Idaho: U.S. Geological Survey : Books and Open-File Reports Section [distributor], Bulletin 1963, iv, 27 p. ill., maps ;28 cm.,
- Sims, P. K., 1991, Great Lakes tectonic zone in Marquette area, Michigan; implications for Archean tectonics in north-central United States: Bulletin 1904-E, p. E1-E17, illus. incl. 2 tables, block diag., geol. sketch map, 71 refs,
- Southwick, D. L.; Morey, G. B.; Holst, Timothy B.; edited by Sims, P. K.; Carter, L. M. H., 1991, Tectonic imbrication and foredeep development in the Penokean Orogen, east-central Minnesota; an interpretation based on regional geophysics and the results of test-drilling. The Penokean Orogeny in Minnesota and upper Michigan; a comparison of structural geology: Bulletin 1904-C,D, 27 p.;illus. incl. geol. sketch maps,
- Stanesco, John D., 1991, Sedimentology and depositional environments of the Lower Permian Yeso Formation, northwestern New Mexico: Bulletin 1808-M, p. M1-M12, illus. incl. sects., sketch map,
- Stone, Paul; Stevens, Calvin H.; Orchard, M. J., 1991, Stratigraphy of the Lower and Middle(?) Triassic Union Wash Formation, east-central California: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Bulletin 1928, iii, 26 p. ill., maps ;29 cm.,
- Stover, Carl W.; Brewer, Lindie R., 1991, United States earthquakes, 1985: U.S. G.P.O., Bulletin 1954, vii, 170 p. ill., maps ;28 cm.,
- Theodore, Ted G.; Orris, Greta J.; Hammerstrom, Jane M.; Bliss, James D., 1991, Gold-bearing skarns: U.S. G.P.O. ; For sale by the Books and Open-File Reports Section, U.S. Geological Survey, Bulletin 1930, iv, 61 p. ill., maps ;28 cm.,
- Tysdal, R. G.; Reynolds, M. W.; Carlson, R. R.; Kleinkopf, M. D.; Rowan, L. C.; Peters, T. J., 1991, Mineral resources of the Sleeping Giant Wilderness Study Area, Lewis and Clark County, Montana: Bulletin 1724-E, p. E1-E31; 1 plate in pocket,
- Tysdal, Russell G., 1991, Depositional environments for strata of composite section of Frontier Formation, Madison Range, southwestern Montana: U.S. G.P.O. ; Books and Open-File Reports Section [distributor], Bulletin 1949, iv, 23 p. ill. ;28 cm.,
- Van Loenen, Richard E.; Bryant, W. Anthony; Lane, Michael E., 1991, Mineral resources of the Devils Playground and Twin Buttes Wilderness Study Areas, Sweetwater County, Wyoming: Bulletin 1759-C, p. C1-C9, 1 table, sketch maps, 16 refs,
- Wanty, Richard B.; Pitman, Janet K.; Fouch, Thomas D., 1991, Ground-water chemistry and diagenetic reactions in Tertiary sandstones of the Green River and Wasatch formations, Uinta Basin, Utah: Bulletin 1787-X, p. X1-X21, illus. incl. 2 tables, sect., sketch map,
- Whipkey, C. E.; Cavaroc, V. V.; Flores, R. M., 1991, Uplift of the Bighorn Mountains, Wyoming and Montana; a sandstone provenance study: Bulletin 1917-D, p. D1-D20, illus. incl. 6 tables, sects., sketch maps, 33 refs,
- White, Donald Edward, 1991, Whistle, a nearly dormant geyser in Upper Geyser Basin, Yellowstone National Park, Wyoming; the first geyser to be studied by research drilling: U.S. G.P.O. ; For sale by the Open-File Reports Section, U.S. Geological Survey, Bulletin 1967, iv, 13 p. ill., maps ;28 cm.,
- Wynn, Jeffrey C.; Sidder, Gary B., 1991, Mineral resource potential of the NB-20-4 Quadrangle, eastern Guayana Shield, Bolivar State, Venezuela: U.S. G.P.O. ; Books and Open-File Reports Section, U.S. Geological Survey [distributor], Bulletin 1960, iii, 16 p. ill., maps ;28 cm.,
- Yeend, Warren E., 1991, Gold placers of the Circle District, Alaska; past, present, and future: U.S. G.P.O., Bulletin 1943, iv, 42 p. ill., maps ;28 cm.,
- Young, Edward J., 1991, Crystalline rocks of the Strawberry Lake area, Front Range, Colorado: U.S. G.P.O. ; For sale by the Books and Open-File reports Section, U.S. Geological Survey, Bulletin 1937, 1 v. (various pagings) :ill., maps (some col.) ;28 cm.,
