Editore: USGS Circ. 788-B, 1979, 22 pp., 1979
Da: Eryops Books, Stephenville, TX, U.S.A.
Soft Cover. Condizione: Very Good. ORIGINAL PUBLICATION; Softcovers; ex-corporate library; in very good condition.
Editore: USGS Circ. 788-D, 1977, 35 pp., 1977
Da: Eryops Books, Stephenville, TX, U.S.A.
Soft Cover. Condizione: Very Good. ORIGINAL PUBLICATION; Softcovers; ex-corporate library; very good condition.