http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Petrology of the upper Ordovician and lower Silurian rocks in the central Appalachians
Photocopy of typescript. Ann Arbor, Mich. : Xerox Microfilms, 1971. 19 cm.
Ph. D. Pennsylvania State University 1965.