Editore: Arkansas Geological and Conservation Commissino Information Circular 20-F, 1968, 15 Pp. + 4 Folded Plates in Rear Pocket., 1968
Da: Eryops Books, Stephenville, TX, U.S.A.
Soft Cover. Condizione: Very Good. Softcovers; ex-corporate library; in very good condition.
Editore: Arkansas Geological and Conservation Commissino Information Circular 20-J, 1972, 40 Pp. + 7 Plates in Rear Pocket., 1972
Da: Eryops Books, Stephenville, TX, U.S.A.
Soft Cover. Condizione: Very Good. Softcovers; ex-corporate library; minor shelfwear; o/w in very good condition.