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Author/Creator
- United States88
- United States. Department of State, issuing body85
- ebrary, Inc72
- United States, participant in treaty64
- United States. Department of State55
- Project Muse43
- Unesco27
- United States. National Park Service25
- United States. Congress. Senate. Committee on Energy and Natural Resources. Subcommittee on National Parks20
- Project Muse. distributor16
- United States. Congress. Senate. Committee on Energy and Natural Resources16
- Cornu, Marie15
- United States, author15
- United States. National Park Service. Cultural Resources15
- ProQuest (Firm)14
- Iglesias Gil, José M.12
- United States. Congress. House. Committee on Resources12
- Hutt, Sherry11
- Italy11
- King, Thomas F.11