GEOLOGY AND COAL RESOURCES OF NORTH PARK, COLORADO; GEOLOGICAL SURVEY BULLETIN 596
Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1915. Soft cover. 121 pages with photographs, tables, and fold out plate showing sections, plus color folded map in the rear pocket. Bound in gray stiff paper covers printed in black. Rear pocket split at the folds, however the map is unaffected..... More