Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1929. Soft cover. Item #39335
This report presents the results of a geologic examination of an area of about 700 square miles in southeastern Montana. Data on the several coal beds were collected in detail, and observations were made on the geologic structure, stratigraphy, and physiographic development. 67 pages with foldout coal sections and photographs, plus the required two folded maps in the rear pocket. Bound in original gray paper covers with printing in black. A very good copy.