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National Park System user fees : hearing before the Subcommittee on National Parks, Historic Preservation, and Recreation of the Committee on Energy and Natural Resources, United States Senate, One Hundred Fifth Congress, first session ... June 19, 1997
- "National Park System user fees : hearing before the Subcommittee on National Parks, Historic Preservation, and Recreation of the Committee on Energy and Natural Resources, United States Senate, One Hundred Fifth Congress, first session ... June 19, 1997"@en
- "National Park System user fees hearing before the Subcommittee on National Parks, Historic Preservation, and Recreation of the Committee on Energy and Natural Resources, United States Senate, One Hundred Fifth Congress, first session ... June 19, 1997"@en