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., by United States. Congress. House. Committee on Resources. Subcommittee on National Parks and Public Lands

Title:	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.
Author:	United States. Congress. House. Committee on Resources. Subcommittee on National Parks and Public Lands
Note:	U.S. G.P.O. :, 2000

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Subject:	Airplanes -- Noise -- Government policy -- Arizona -- Grand Canyon National Park
Subject:	Grand Canyon National Park (Ariz.)
Subject:	Noise pollution -- Government policy -- Arizona -- Grand Canyon National Park
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