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The Sentinel Butte lignite field, North Dakota and Montana. The Miles City coal field, Montana. Coal near the Crazy Mountains, Montana. The Red Lodge coal field, Montana. The Lewistown coal field, Montana
The Sentinel Butte lignite field, North Dakota and Montana. The Miles City coal field, Montana. Coal near the Crazy Mountains, Montana. The Red Lodge coal field, Montana. The Lewistown coal field, Montana