Valley Forge 75 Minute Quadrangle, Research Map Permalink: https://digitalcollections.tricolib.brynmawr.edu/object/bmc86092 Item Description Member of Geology Maps Publisher Geological Survey Physical Form Cartographic Map Genre geological maps Date Created 1952 Temporal Subject Twentieth century Geographic Subject Chester County (Pa.) Language English Extent 1 map : color ; 27 x 22 inches Resource Type Still Image Internet Media Type image/tiff Digital Origin reformatted digital Institution Bryn Mawr College Library pbm Department Bryn Mawr College Special Collections Shelf Locator Collier Science Library, Geology Map Collection Local Identifier GIS-00137 PID bmc:86092 Record Content Source pbm Rights Statement IN COPYRIGHT