1993. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey. English. Public. Wyoming and Cheyenne Region.
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1993. 2002-06-01T04:00:00Z. 2014-03-21T19:31:45Z. Geological Survey (U.S.). The Survey ; Copies can be purchased from Books and Open-File Reports Section. English. Public. Montana, Fort Peck Indian Reservation, Valley County, and Porcupine Creek.