1. Ice Age Floods National Geologic Trail; land adjacent to Walnut Canyon National Monument; amend the National Trails System Act; and including in the NPS certain sites in Williamson County, TN : hearing before the Subcommittee on National Parks of the Committee on Energy and Natural Resources, United States Senate, One Hundred Ninth Congress, first session on S. 206, S. 556, S. 588, S. 955, June 28, 2005 Author/Creator: United States. Congress. Senate. Committee on Energy and Natural Resources. Subcommittee on National Parks Publication/Creation: Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2005 Resource Type: Book Access & Availability: Loading