Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1975. Softcover. Item #46753
Sedimentary rocks rangeing in age from Devonian to Holocene are exposed within an area of about 100 square miles in southern Yellostone National Park where the original cover of volcanic rocks has been stripped away by erosion. 60 pages with maps, photographs, bibliography and index, plus the map plate in the rear pocket. Bound in original cream colored stiff paper lettered and illustrated in brown. Small date stamp on the front cover. A a near fine copy.