- Aubrey, W. M.; Molenaar, C. M.; Baird, J. K., 1991, Geologic framework and stratigraphy of Cretaceous and Tertiary rocks of the Southern Ute Indian Reservation, southwestern Colorado: Professional Paper 1505-B,C, 36 p.; 3 plates in pocket,
- Bartow, J. Alan, 1991, The Cenozoic evolution of the San Joaquin Valley, California: Professional Paper 1501, 40 p.; 2 plates in pocket,
- Bertoldi, G. L.; Johnston, R. H.; Evenson, K. D., 1991, Ground water in the Central Valley, California; a summary report: Professional Paper 1401-A, p. A1-A44,
- Busby, J. F.; Plummer, L. N.; Lee, R. W.; Hanshaw, B. B., 1991, Geochemical evolution of water in the Madison Aquifer in parts of Montana, South Dakota, and Wyoming: Professional Paper 1273-F, p. F1-F89,
- Bybell, L. M.; Poore, R. Z., 1991, Calcareous nannofossils and planktic foraminifers from Enewetak Atoll, western Pacific Ocean: Professional Paper 1513-C, p. C1-C21,
- Carr, W. J.; Dickey, D. D., 1991, A contribution to the structural history of the Vidal-Parker region, California and Arizona, with a section on level line: Professional Paper 1430, 40 p.; 5 plates in pocket,
- Chin, E. H.; Aldridge, B. N.; Longfield, R. J., 1991, Floods of February 1980 in Southern California and central Arizona: Professional Paper 1494, 126 p.; 3 plates in pocket,
- Drewes, Harald, 1991, Description and development of the Cordilleran orogenic belt in the Southwestern United States and northern Mexico: Professional Paper 1512, 92 p.; 2 plates in pocket,
- Edited by Hatch, Norman L., Jr., 1991, The bedrock geology of Massachusetts: Professional Paper 1366-E-J, 264 p.,
- edited by Williams, Richard S., Jr.; Ferrigno, Jane G., 1991, Glaciers of the Middle East and Africa: Professional Paper 1386-G, p. G1-G70,
- Freethey, G. W.; Cordy, G. E., 1991, Geohydrology of Mesozoic rocks in the upper Colorado River basin in Arizona, Colorado, New Mexico, Utah, and Wyoming, excluding the San Juan Basin: Professional Paper 1411-C, p. C1-C118, 6 plates in pocket,
- Gibson, T. G.; Margerum, Richard, 1991, Larger foraminifer biostratigraphy of PEACE boreholes, Enewetak Atoll, western Pacific Ocean: Professional Paper 1513-D, p. D1-D14,
- Hosman, R. L.; Weiss, J. S., 1991, Geohydrologic units of the Mississippi Embayment and Texas coastal uplands aquifer systems, south-central United States: Professional Paper 1416-B, p. B1-B19, 19 plates in separate case,
- Jenner, C. B.; Lins, H. F., 1991, Climatic atlas of the Delaware River basin: Professional Paper 1392, 127 p.,
- Leo, G. W., 1991, Oliverian domes, related plutonic rocks, and mantling Ammonoosuc Volcanics of the Bronson Hill Anticlinorium, New England Appalachians: Professional Paper 1516, 92 p.; 1 plate in pocket,
- Newton, G. D., 1991, Geohydrology of the regional aquifer system, western Snake River plain, southwestern Idaho: Professional Paper 1408-G, p. G1-G52; 1 plate in pocket,
- Prudic, D. E.; Burbey, T. J., 1991, Conceptual evaluation of regional ground-water flow in the carbonate-rock province of the Great Basin, Nevada, Utah, and adjacent states: Professional Paper 1409-D, p. D1-D84,
- Robertson, Frederick N., 1991, Geochemistry of ground water in alluvial basins of Arizona and adjacent parts of Nevada, New Mexico, and California: Professional Paper 1406-C, p. C1-C90,
- Roehler, H. W., 1991, Revised stratigraphic nomenclature for the Wasatch and Green River formations of Eocene age, Wyoming, Utah, and Colorado: Professional Paper 1506-B, p. B1-B38,
- Roehler, H. W., 1991, Godiva Rim Member; a new stratigraphic unit of the Green River Formation in Southwest Wyoming and Northwest Colorado: Professional Paper 1506-C, p. C1-C17,
- Smith, J. T., 1991, Cenozoic giant pectinids from California and the Tertiary Caribbean Province; Lyropecten, "Macrochlamis," Vertipecten, and Nodipecten species: Professional Paper 1391, 155 p.,
- Vroblesky, D. A.; Fleck, W. B., 1991, Hydrogeologic framework of the coastal plain of Maryland, Delaware, and the District of Columbia: Professional Paper 1404-E, p. E1-E45; 2 plates in pocket,
- Wardlaw, B. R.; Henry, T. W.; Martin, W. E., 1991, Sediment facies of Enewetak Atoll lagoon: Professional Paper 1513-B, p. B1-B60,
