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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.).
1972. 2013-02-21T14:30:22Z. 2013-03-18T22:37:23Z. Maberry, John O., 1935-. U.S. Geological Survey. English. Public. Colorado, Arapahoe County, Douglas County, Arapahoe County (Colo.), and Douglas County (Colo.).
1871. 2012-02-16T21:28:30Z. 2015-04-21T22:03:05Z. Stanton, Fred J. Fred J. Stanton?], Lith. Chas. Shober). English. Public. Denver (Colo.) and Arapahoe County (Colo.).
1973. 2013-02-21T20:15:09Z. 2013-03-18T22:37:26Z. Maberry, John O., 1935-. U.S. Geological Survey. English. Public. Colorado, Arapahoe County, Douglas County, Arapahoe County (Colo.), and Douglas County (Colo.).