Issues regarding the new NPS methodology used to evaluate the achievement of natural quiet restoration standards in Grand Canyon National Park
oversight hearing before the Subcommittee on National Parks and Public Lands of the Committee on Resources, House of Representatives, One Hundred Sixth Congress, first session, May 25, 1999, Washington, DC.
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Image source: Open LibraryUnited States. Congress. House. Committee on Resources. Subcommittee on National Parks and Public Lands.1 editions
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United States. Congress. House. Committee on Resources. Subcommittee on National Parks and Public Lands.
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