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Author/Creator
- United States28
- National Speleological Society13
- Fergusson, James, 1808-188612
- Geological Survey (U.S.)11
- United States. Congress. House11
- ebrary, Inc11
- Matthews, Larry E.10
- United States. Congress. House. Committee on Public Lands. (1805-1951)10
- Waltham, Tony10
- Hovey, Horace Carter, 1833-19147
- Project Muse7
- Smithsonian Institution. Board of Regents7
- Caus, Salomon de, -16266
- Mercer, Henry Chapman, 1856-19306
- United States. Congress. Senate. Committee on Energy and Natural Resources. Subcommittee on Public Lands, National Parks, and Forests6
- Brady, James Edward, 1948-5
- Dowd, Marion5
- Luray Caverns Corporation5
- Prufer, Keith M. (Keith Malcolm), 1960-5
- TVF International (Firm), film distributor5