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Author/Creator
- Geological Survey (U.S.)3
- Bailey, Roy A.1
- Balster, Clifford A.1
- Bishop, Gale A.1
- Hoge, Harry P.1
- Hylbert, David K., 1938-1
- Kentucky Geological Survey1
- Montana Bureau of Mines and Geology1
- Philley, John C. (John Calvin)1
- Ross, Clarence S. (Clarence Samuel), 1880-19751
- Smith, Robert L.1
- United States. National Aeronautics and Space Administration1
- United States. National Park Service1