1968. 2012-01-31T19:18:36Z. 2012-03-05T17:37:55Z. Rohrer, Willis L. U.S. Geological Survey. English. Public. Wyoming and Fremont County.
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1966. 2012-01-09T16:09:30Z. 2012-03-05T17:31:16Z. Rohrer, Willis L. The Survey. English. Public. Wyoming and Fremont County.
