The 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 Fifth Congress, Second Session ... September 24, 1998, Washington, DC.
United States. Congress. House. Committee on Resources. Subcommittee on National Parks and Public Lands
U.S. Government Printing Office, 1998 - Airplanes - 166 pages
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acoustic Ahuja air tour aircraft noise aircraft overflights Alberti Arizona Arnberger BB&N believe Canyon National Park Canyon river experience Chairman Colorado River corridor Colorado River Management computation dB(A decibels definition of natural draft Wilderness Management effects end of hearing Environmental Assessment fact Faleomavaega flight Forest Service found at end going Grand Canyon National Grand Canyon river Grisham Halvorson Hansen helicopter Helicopter Association International impact issue J R Engineering lateral attenuation motorized rafts National Park Service natural quiet operations percent Phantom Ranch potential wilderness protect public access question recreation Reffalt report to Congress resource restoration of natural River Management Plan River of Dreams River Outfitters roads scientific SFAR Shadegg sound levels statement substantial restoration testimony Thank trails visitors Western River Expeditions Wilderness Act wilderness area wilderness designation Wilderness Management Plan Wilderness Planning