1975. 2013-05-30T19:59:52Z. 2013-06-14T17:58:35Z. McCain, Jerald F. Dept. of the Interior, U.S. Geological Survey. English. Public. Colorado, Adams County, Arapahoe County, Denver Metropolitan Area, Douglas County, Jefferson County, Boulder County, and Denver Metropolitan Area (Colo.).
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1972. 2013-04-23T15:42:36Z. 2013-05-02T15:46:53Z. Scott, Glenn Robert, 1918-. U.S. Geological Survey. English. Public. Colorado and Jefferson County.
