1975. 2013-05-28T17:19:11Z. 2013-06-14T17:58:04Z. McCain, Jerald F. U.S. Geological Survey. English. Public. Colorado, Boulder County, Larimer County, and Weld County.
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1975. 2013-06-13T13:33:10Z. 2013-06-26T19:51:05Z. McCain, Jerald F. The Survey. English. Public. Front Range (Colo. and Wyo.), Colorado, Douglas County, Elbert County, El Paso County, Teller County, and Fremont County.
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.).