The Wissahickon Schist At Philadelphia Showing Areal Geology, Metamorphic Zones and Numbered Localities Permalink: https://digitalcollections.tricolib.brynmawr.edu/object/bmc85993 Item Description Member of Geology Maps Description From Weiss, Judith, The Wissahickon Schist at Philadelphia, Bryn Mawr College, 1948, Plate I. Physical Form Cartographic Map Genre geological maps Date Created 1948 Temporal Subject Twentieth century Geographic Subject Philadelphia County (Pa.) Language English Extent 1 map : color ; 21.5 x 35 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-00037 PID bmc:85993 Record Content Source pbm Rights Statement IN COPYRIGHT