THE NORTHWARD EXTENSION OF THE SHERIDAN COAL FILED, BIGHORN AND ROSEBUD COUNTIES, MONTANA: GEOLOGICAL SURVEY BULLETIN NO. 806-B
Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1929. Soft cover. 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..... More