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Author/Creator
- Geological Survey (U.S.)172
- United States. Central Intelligence Agency34
- United States. National Aeronautics and Space Administration18
- United States. Central Intelligence Agency. Cartography Center10
- Corporación Venezolana de Guayana. Técnica Minera9
- Butman, Bradford7
- Weary, David J.6
- National Uranium Resource Evaluation Program5
- Planetary Geology and Geophysics Program (U.S.)5
- United States. National Park Service5
- Wynn, Jeffrey C.5
- Bohannon, Robert G.4
- Fullerton, David S.4
- Griffitts, Wallace R.4
- Harrison, Richard W.4
- Hinkle, Margaret E.4
- Tanaka, Kenneth L.4
- U.S. Census Bureau4
- Watts, K. C.4
- Ashley, Roger P. (Roger Parkmand), 1940-3