1971. 2012-10-15T14:56:17Z. 2012-10-15T14:56:17Z. Hansen, Wallace R., 1920-. Dept. of the Interior, U.S. Geological Survey. English. Public. Colorado, Black Canyon of the Gunnison, Gunnison River, Black Canyon of the Gunnison (Colo.), and Gunnison River (Colo.).
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1971. 2012-10-26T19:43:04Z. 2022-12-08T04:41:00Z. Williams, Paul L. (Paul Lincoln), 1932-. Dept. of the Interior, U.S. Geological Survey. English. Public. Utah, Sevier County, Piute County, Emery County, Wayne County, and Garfield County.
1971. 2012-11-06T16:22:36Z. 2012-11-06T16:22:36Z. Richmond, Gerald Martin, 1914-. Dept. of the Interior, U.S. Geological Survey. English. Public. Yellowstone National Park, Wyoming, and Teton County.
1971. 2012-11-06T16:19:57Z. 2012-11-06T16:19:57Z. Richmond, Gerald Martin, 1914-. Dept. of the Interior, U.S. Geological Survey. English. Public. Yellowstone National Park, Wyoming, Teton County, and Park County.