Stratigraphic studies of the Silurian rocks of Pennsylvania; Part 2 : Subsurface maps of the Silurian Rocks of western Pennsylvania and adjacent areas
Harrisburg, Pa. Commonwealth of Pennsylvania Dept. of Internal Affairs, 1965. Cardboard Covers. Brown Folio w/ black binding; 8 p., 9 fold. maps. 46 cm. Pennsylvania. Bureau of Topographic and Geologic Survey Special bulletin 11; Geology, Stratigraphic -- Silurian. Geology -- Pennsylvania. Geology -- New York (State) . More