United States. Congress. Senate. Committee on Energy and Natural Resources. Subcommittee on National Parks.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 2006.
2006
Beals, Ralph L. (Ralph Leon), 1901-1985 author.
Berkeley, California U.S. Department of the Interior, National Park Service, Field Division of Education, 1935.
1935