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Introduction. Stratigraphy and coal beds of the Indiana coal field. The Washburne lignite field, North Dakota. The Fort Berthold Indian Reservation lignite field, North Dakota. The Fort Peck Indian Reservation lignite field, Montana. The central part of the Bull Mountain coal field, Montana. The Milk River coal field, Montana. Notes on the coals of the Custer National Forest, Montana
M. R. Campbell, George H. Ashley, Carl D. Smith, R. W. Richards, L.J. Pepperberg, Carroll H. Wegemann
1910, Bulletin 381-A
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