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1964. 2011-06-07T15:06:03Z. 2020-10-16T19:17:55Z. Sims, P. K. (Paul Kibler), 1918-2011. The Survey. English. Public. Colorado and Gilpin County.
1996. 2002-06-01T04:00:00Z. 2022-07-11T15:16:13Z. Geological Survey (U.S.). The Survey. English. Public. Colorado and Gilpin County. Holocene.