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1890. 2011-05-17T17:04:55Z. 2015-10-21T14:59:19Z. Geological Survey (U.S.). The Survey. English. Public. Arapahoe County (Colo.), Denver Region (Colo.), Douglas County (Colo.), and Elbert County (Colo.).
1955. 2008-05-15T14:13:21Z. 2011-03-28T23:15:20Z. Geological Survey (U.S.). The Survey. English. Public. Denver Region (Colo.), Colorado, and Rocky Mountains.
1972. 2012-11-26T21:36:31Z. 2013-03-18T22:28:55Z. Chase, G. H. (George Holden), 1917-. Dept. of the Interior, U.S. Geological Survey. English. Public. Colorado, Denver Region, Denver Metropolitan Area, Denver Region (Colo.), and Denver Metropolitan Area (Colo.).
1989. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. United States. Bureau of Land Management. U.S. Bureau of Land Management?. English. Public. Colorado, Denver Region, and Denver Region (Colo.).
1938. 2002-07-23T18:02:17Z. 2020-08-07T15:32:09Z. H.M. Gousha Company. H.M. Gousha. English. Public. Denver Region (Colo.), Colorado, Denver Region, and Denver.