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Author/Creator
- Geological Survey (U.S.)1,009
- United States. National Aeronautics and Space Administration97
- United States. National Park Service44
- Maps.com (Firm)42
- Afghanistan. Department of Geological Survey37
- Bohannon, Robert G.27
- Planetary Geology Program (U.S.)25
- Planetary Geology and Geophysics Program (U.S.)24
- Tanaka, Kenneth L.18
- Billingsley, George H.16
- Kellogg, Karl S.16
- AM (Publisher)15
- Evarts, Russell C.15
- Turner, Kenzie J.15
- Morton, Douglas M.14
- Weary, David J.13
- Denson, N. M. (Norman MacLaren), 1914-12
- National Archives (Great Britain)12
- Scott, David Holcomb, 1916-11
- Priest, Susan S.10