Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1957. Softcover. Item #43863
A description of extrusive pyroclastic and flow rocks of El Modeno volcanics of middle to late Miocene age. Pages 313 through 334 with photographs, map, tables, references, and index, plus the two folded plates in the rear pocket. Bound in original light gray paper covers with printing in black. A near fine copy.