Geologic map showing total thickness of coal in the north half of the Powder River basin, southeastern Montana and northeastern Wyoming

I-2131-A Geologic map showing total thickness of coal in the north half of the Powder River basin, southeastern Montana and northeastern Wyoming, scale 1:200,000, 1991, ISBN 978-0-607-79300-0 Keywords: Coal, Geologic map, Bedrock, Powder river basin