1991. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; Books and Open-File Reports Section. English. Public. Wyoming, Gillette, and Campbell County.
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1975. 2013-05-22T18:56:14Z. 2013-06-13T15:35:50Z. Hadley, R. F. (Richard Frederick), 1924-. U.S. Geological Survey. English. Public. Wyoming and Campbell County.
1974. 2013-05-22T18:54:47Z. 2013-06-13T15:35:49Z. King, N. J. (Norman Julius), 1925-. U.S. Geological Survey. English. Public. Wyoming and Campbell County.