Published by USGS Professional Paper 985, 1976, iii + 25 pp. + 3 plates (w/ correlation chart in pocket)., 1976
Seller: Eryops Books, Stephenville, TX, U.S.A.
Soft Cover. Condition: Very Good. ORIGINAL PUBLICATION; Softcovers; ex-corporate library; minor shelfwear w/ small creases at corners of wraps and pages; o/w very good condition.