Investigations of the Origins and Metamorphic History of Pre-Cambrian Gneisses Downingtown 7.5 Minute Quadrangle, Southeastern Pennsylvania Permalink: https://digitalcollections.tricolib.brynmawr.edu/object/bmc85979 Item Description Member of Geology Maps Description From Demmon, F., Investigations of the Origins and Metamorphic, BMC 1977. Physical Form Cartographic Map Genre geological maps Date Created 1977-05-10 Temporal Subject Twentieth century Geographic Subject Chester County (Pa.) Language English Extent 1 map : color ; 25.75 x 23.75 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-00023 PID bmc:85979 Record Content Source pbm Rights Statement IN COPYRIGHT