Impacts of climate change to national parks : hearing before the Subcommittee on National Parks of the Committee on Energy and Natural Resources, United States Senate, One Hundred Eleventh Congress, first session, to receive testimony on the current and expected impacts of climate change on units of the national park system, October 28, 2009.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2010.