- Bascom, Florence; Wherry, Edgar Theodore; Stose, George Willis; Jonas, A. I., 1931, Geology and mineral resources of the Quakertown-Doylestown district, Pennsylvania and New Jersey: U.S. Govt. Print. Off., Bulletin 828, 62 p.,
- Burchard, E. F., 1931, Contributions to economic geology, 1930: Part I. Metals and nonmetals except fuels. Iron ore on Canyon Creek, Fort Apache Indian Reservation, Arizona: Bulletin 821-C, 78 p.,
- Cushing, Henry Platt; Leverett, Frank; Van Horn, Frank Robertson., 1931, Geology and mineral resources of the Cleveland district, Ohio: U.S. Govt. Print. Off., Bulletin 818, 138 p.,
- Knappen, R. S.; Moulton, G. F., 1931, Contributions to economic geology (short papers and preliminary reports), 1930, Part II, Mineral fuel. Geology and mineral resources of parts of Carbon, Big Horn, Yellowstone and Stillwater counties, Montana: Bulletin 822-A, 1-70 p.,
- Loughlin, Gerald Francis; Burchard, E. F., 1931, Contributions to economic geology (short papers and preliminary reports, 1930 : Part I. - Metals and nonmetals except fuels: U.S. G.P.O., Bulletin 821, 78 p. :ill., xviii pl. (incl. some fold. maps) ;24 cm.,
- Lovering, T. S., 1931, Contributions to economic geology (short papers and preliminary reports), 1930, Part II, Mineral fuel. The Granby anticline, Grand County, Colorado: Bulletin 822-B, 71-76 p.,
- Mertie, John Beaver, Jr., 1931, A geologic reconnaissance of the Dennison Fork district, Alaska: U.S. Govt. Print. Off., Bulletin 827, 44 p. :incl. maps, tables, 7 pl. (part fold; incl. 2 maps (in pocket)) ;23 cm.,
- Miser, Hugh D., 1931, Contributions to economic geology (short papers and preliminary reports), 1930 : Part II. - Mineral fuels: U.S. G.P.O., Bulletin 822, 100 p. :ill., ix pl. (incl. some fold. maps) ;24 cm.,
- Nickles, John M., 1931, Bibliography of North American geology, 1919-1928: U.S. Govt. Print. Off., Bulletin 823, 1005 p.,
- Nickles, John M., 1931, Bibliography of North American geology, 1929 and 1930: U.S. G.P.O., Bulletin 834, 280 p. ;24 cm.,
- Noble, Levi Fatzinger, 1931, Nitrate deposits in southeastern California, with notes on deposits in southeastern Arizona and southwestern New Mexico: U.S. Govt. Print. Office, Bulletin 820, 108 p. ill., maps ;25 cm.,
- Reeves, Frank; Ross, C. P., 1931, Contributions to economic geology (short papers and preliminary reports), 1930, Part I, Metals and nonmetals except fuels. A geologic study of the Madden Dam project, Alhajuela, Canal Zone: Bulletin 821-B, 11-49 p.,
- Ross, C. P., 1931, Contributions to economic geology (short papers and preliminary reports), 1930, Part I, Metals and nonmetals except fuels. A graphic history of metal mining in Idaho: Bulletin 821-A, 1-9 p.,
- Short, Maxwell Naylor, 1931, Microscopic determination of the ore minerals: U.S. Govt. Print. Off., Bulletin 825, 204 p. :incl. illus., tables. 11 pl. (part col.) ;23 cm.,
- Spieker, E. M., 1931, Contributions to economic geology (short papers and preliminary reports), 1930, Part II, Mineral fuel. Bituminous sandstone near Vernal, Utah: Bulletin 822-C, 100 p.,
- Spieker, Edmund M., 1931, The Wasatch Plateau coal field, Utah: U.S. Govt. Print. Off., Bulletin 819, 210 p.,
- Wilmarth, Mary Grace, 1931, Names and definitions of the geologic units of California: U.S. Govt. Print. Off., Bulletin 826, 97 p.,
