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2001. 2002-06-01T04:00:00Z. 2023-02-11T04:46:19Z. Geological Survey (U.S.). The Survey. English. Public. Colorado, Boulder County, Weld County, and Adams 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.
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.
1994. 2002-06-01T04:00:00Z. 2016-06-16T15:42:45Z. Geological Survey (U.S.). The Survey : [Open-File Reports Section, distributor]. English. Public. Colorado, Jefferson County, and Boulder County.
1996. 2002-06-01T04:00:00Z. 2016-06-16T15:42:43Z. Geological Survey (U.S.). The Survey ; For sale by Information Services. English. Public. Colorado, Boulder County, and Jefferson County.
1979. 2013-05-28T19:01:54Z. 2013-06-14T17:58:09Z. Hillier, Donald E. U.S. Geological Survey. English. Public. Colorado, Boulder County, Larimer County, and Weld County.