Editore: Oklahoma Geological Survey Bull. 40-J, 1927, 22 pp., 1927
Da: Eryops Books, Stephenville, TX, U.S.A.
Soft Cover. Condizione: Good. ORIGINAL PUBLICATION; Softcovers; ex-library; spine reinforced w/ tape; small tear on bottom edge of front wraps and first four leaves and top of front wrap; light creasing of corners; light foxing of wraps; o/w good condition.