1. Geologic map of the Jefferson quadrangle, Park and Summit counties, Colorado [cartographic material]
1976. 2012-05-31T17:57:09Z. 2012-06-07T16:56:03Z. Barker, Fred, 1928-. The Survey. English. Public. Colorado and Park County.
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1957. 2011-04-20T17:11:26Z. 2012-02-14T23:29:24Z. Barker, Fred, 1928-. U.S. Geological Survey. English. Public. Alaska.
1982. 2012-06-27T19:15:42Z. 2012-07-05T13:04:20Z. Barker, Fred, 1928-. The Survey. English. Public. Wyoming, Big Horn County, and Johnson County.
