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Author/Creator
- Geological Survey (U.S.)265
- United States. National Park Service22
- AM (Publisher)15
- Adam Matthew Digital (Firm)12
- Evarts, Russell C.12
- United States. National Aeronautics and Space Administration10
- National Archives (Great Britain)9
- Billingsley, George H.8
- Morton, Douglas M.8
- University of London. School of Oriental and African Studies8
- Hudson, Mark R.7
- Kellogg, Karl S.7
- Turner, Kenzie J.7
- British Library6
- Cossette, P. M. (Pamela M.)6
- Matti, Jonathan C.6
- Bohannon, Robert G.5
- Clark, Allan K.5
- Morris, Robert R. (Geologist)5
- Newberry Library5