The impacts of climate change on America's national parks : oversight field hearing before the Subcommittee on National Parks, Forests, and Public Lands of the Committee on Natural Resources, U.S. House of Representatives, One Hundred Eleventh Congress, first session, Tuesday, April 7, 2009.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2009.