Title: Issues regarding the new NPS methodology used to evaluate the achievement of natural quiet restoration standards in Grand Canyon National Park
Subtitle: 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.
Subjects: Airplanes, Government policy, Noise, Noise pollution
Places: Arizona, Grand Canyon National Park, Grand Canyon National Park (Ariz.)