1980. 2012-06-25T18:33:54Z. 2012-07-05T13:03:11Z. Hansen, Wallace R., 1920-. U.S. Geological Survey. English. Public. Colorado and Moffat County.
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1961. 2012-09-12T18:00:38Z. 2013-03-18T22:17:58Z. Hansen, Wallace R., 1920-. U.S. Geological Survey. English. Public. Utah, Daggett County, Colorado, and Moffat County.
1963. 2011-05-17T15:34:02Z. 2012-02-14T00:28:16Z. Hansen, Wallace R., 1920-. U.S. Geological Survey. English. Public. Kentucky, Wolfe County, and Breathitt County.