1988. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey : [Books and Open-File Reports Section, distributor]. English. Public. Montana and Fort Peck Indian Reservation.
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1996. 2002-06-01T04:00:00Z. 2014-03-21T19:31:28Z. Geological Survey (U.S.). The Survey ; Earth Science Information Center, Open-File Reports Section [distributor]. English. Public. Montana, Fort Peck Indian Reservation, and Fort Peck Indian Reservation.
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.