Editore: Pennsylvania Geological Survey / Bureau of Topographic and Geologic Survey, 1961
Da: Eryops Books, Stephenville, TX, U.S.A.
Soft cover. Condizione: Good. ORIGINAL 1961 PUBLICATION; softcover; ex-corporate library; includes 7 large folded plates in rear pocket (COMPLETE for this publication); rear hinge reinforced w/ tape; foxing spots on endpages and edges; a couple of sentences underlined; small hole at top of one folded plate; otherwise in good condition. Book.