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1963. 2011-12-12T21:24:31Z. 2022-03-29T20:39:06Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Colorado.
1963. 2012-09-21T15:54:03Z. 2013-03-18T22:19:19Z. Wells, John D. U.S. Geological Survey. English. Public. Colorado, Boulder County, and Jefferson County.
1963. 2002-07-18T16:18:42Z. 2020-07-17T19:04:08Z. Colorado. Dept. of Highways. The Department. English. Public. Colorado.