 Date: 2010-12-07 03:34:54Geology Fort Peck Indian Reservation Big Muddy Creek Fort Union Formation Poplar River Core sample Roosevelt County Montana Coal Drilling Montana Geography of the United States Fort Peck Montana | |  UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Results of exploratory drilling for lignite in 1978, Fort Peck Indian Reservation, Roosevelt County, Montana
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