A Survey of the Recreational Resources of the Colorado River Basin
National Park Service and Department of the Interior. 1950. A Survey of the Recreational Resources of the Colorado River Basin. Government Printing Office, Washington, D.C.
The Bureau of Reclamation, in November 1940, under the authority of the Adjustment Act, requested the National Park Service to identify the scenic, scientific and recreational resources of the Colorado Basin, as a part of a comprehensive plan for the utilization of the water resources of the region.