Published by USGS Circ. 790, 1979, 163 pp. text + separate envelope w/ 3 maps., 1979
Seller: Eryops Books, Stephenville, TX, U.S.A.
Soft Cover. Condition: Good. ORIGINAL 1979 PUBLICATION; Softcovers text + separate envelope w/ 3 maps (complete); ex-corporate library; text w/ minor shelfwear; printed map envelope w/ creased edges; o/w both in good condition.