COAL-BEARING UPPER PENNSYLVANIAN AND LOWER PERMIAN ROCKS, WASHINGTON AREA, PENNSYLVANIA: PART 1, LITHOFACIES; PART 2, ECONOMIC AND ENGINEERING GEOLOGY: GEOLOGICAL SURVEY PROFESSIONAL PAPER 621
Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1971. First edition. first printing. Softcover and hardcover. 47 pages with photographs, columnar sections, graphs, tables, refernces and index, plus the required eight folded color map plates and two folded figures in the pocket. Bound in original white paper covers printed in..... More