1976. 2013-08-20T13:27:29Z. 2013-08-30T19:15:54Z. Denson, N. M. (Norman MacLaren), 1914-. The Survey. English. Public. Wyoming, Converse County, Niobrara County, and Natrona County.
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1969. 2012-10-11T19:27:16Z. 2012-10-11T19:27:16Z. Denson, N. M. (Norman MacLaren), 1914-. U.S. Geological Survey. English. Public. Wyoming, Natrona County, Converse County, Carbon County, and Albany County.