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Author/Creator
- Geological Survey (U.S.)9
- Montana Bureau of Mines and Geology3
- Hester, T. C.2
- Laird, Wilson M. (Wilson Morrow), 1915-19972
- Nieschmidt, Constance L. (Constance Leatherock), 1898-19652
- Schmoker, J. W.2
- Sloss, L. L. (Laurence Louis), 1913-19962
- Gardner, L. S. (Louis Samuel), 1904-1
- Geological Suvey (U.S.)1
- Hadley, H. D. (Herbert D.)1
- Imlay, Ralph W. (Ralph Willard), 1908-19891