1985. 2002-06-01T04:00:00Z. 2023-10-11T03:01:27Z. Geological Survey (U.S.). The Survey : [Books and Open-File Reports Section, distributor]. English. cartographic image. Public. Oklahoma and Colorado.
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1972. 2013-04-17T20:24:26Z. 2013-05-02T15:44:47Z. Schmidt, Paul W. U.S. Geological Survey. English. Public. Colorado and Jefferson County.
1973. 2013-04-23T15:54:52Z. 2013-05-02T15:46:54Z. Gable, Dolores J., 1922-. U.S. Geological Survey. English. Public. Colorado, Boulder County, Gilpin County, and Jefferson County.