|
| U. S. Department of the Interior (9) | U. S. Department of the Interior, Division of Motion Pictures (1) | U. S. Economic Opportunity Office (1) |
| U. S. Forest Service (1) | U. S. General Accounting Office (1) | U. S. Geological Survey (2) |
| U.S. Census Office (3) | U.S. Coast and Geodetic Survey (1) | U.S. Congress. Senate. Committess on Public Lands and Surveys (1) |
| U.S. Department of Agriculture (4) | U.S. Department of the Interior, National Park Service (7) | U.S. Department of the Interior, National Park Service, Great Smoky Mountains National Park (3) |
| U.S. Economic Development Administration (1) | U.S. Geological Survey (10) | U.S. Government Printing Office (3) |
| U.S. House Committee on Interior and Insular Affairs (2) | U.S. House Committee on Public Lands (1) | U.S. House of Representatives Committee on Resources (1) |
| U.S. National Committee for Man and the Biosphere (2) | U.S. Senate (1) | U.S. Senate Committee on Energy and Natural Resources (1) |
| U.S.), G. (1) | U.S.A., E. (1) | Udall, J. (1) |
| Udall, S. (3) | Udawatta, R. (1) | Ullyart, L. (1) |
| Ulmann, D. (1) | Underwood, C. (1) | Underwood, H. (1) |
| Underwood, J. (1) | Underwood, M. (1) | Underwood, S. (1) |
| Underwood, T. (3) | Unger, S. (1) | Union Carbide Corporation, Nuclear Division (1) |
| United States (3) | United States Bureau of Indian Affairs (1) | United States Bureau of Public Roads (1) |
| United States Committee on Energy and Natural Resources (1) | United States Congress (2) | House Committee on Resources United States Congress (1) |
| United States Department of Agriculture, Soil Conservation Service (1) | United States Department of the Interior (2) | United States Federal Civil Works Administration (2) |
| United States National Park Service, Denver Service Center (1) | United States Park Service (1) | United States Senate (1) |
| United States. Congress. House. Committee on Natural Resources (1) | United States. Congress. Senate. Committee on Energy and Natural Resources. Subcommittee on Public Lands and Reserved Water (1) | United States: Office of Archeology and Historic Preservation (1) |
| Universal Map (1) | University of Idaho (1) | University of Tennessee (2) |
| University of Tennessee Libraries (1) | Unrug, R. (2) | Unrug, S. (2) |
| Uphouse, S. (1) | Uplands Field Research Laboratory (15) | Urban, A. (1) |
| Urquijo, S. (1) | Utech, F. (1) | |
