THE ASHLAND COAL FIELD, ROSEBUD, POWDER RIVER, AND CUSTER COUNTIES, MONTANA; GEOLOGICAL SURVEY BULLETIN 831-B
Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1932. First edition. Soft cover. 105 pages with map and photographic plates bound in plus the required large fold map and 37 coal sections in the rear pocket. Bound in original gray printed paper covers. Signature of well known geologist Olaf Jenkins..... More