TY - BOOK ED - United States. TI - 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 PY - 1999/// [i.e. 2000] CY - Washington PB - U.S. G.P.O., For sale by the U.S. G.P.O., Supt. of Docs., Congressional Sales Office KW - Airplanes KW - Noise KW - Government policy KW - Arizona KW - Grand Canyon National Park KW - Noise pollution KW - Grand Canyon National Park (Ariz.) N1 - Shipping list no.: 2000-0516-M; "Serial no. 106-33."; CRDP Program record; Includes bibliographical references; Microfiche; Washington, D.C.; U.S. G.P.O., Supt. of Docs; 2000; 2 microfiches : negative ER -