Geologic Atlas of the United States. Philadelphia Folio, Pennsylvania, Delaware, New Jersey 1909
Washington DC: United States Geological Survey, 1909. Early edition. Paperback. elephant folio, ca. 18.5" x 22" pp. 2 of text on back of front cover and on rear cover inside, 23 pages text inside followed by 4 topographic maps showing the Philadelphia area and westwatrd and southward into New Jeresy..... More