Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1927. Softcover. Item #49172
A monographic treatment of all recognized invertebarate marine fossils of the Upper Triassic of North America is set forth in this volume. 135 pages plus all plates I-CXXI bound in the rear. Bound in original tan paper covers with lettering in black. Spine professionally rebacked with orignal spine pressed on. Library stamps on the front cover. No other library markings, stamps, pockets or plates were ever present. A very good copy.