Editore: Oklahoma Academy of Science, 1954
Da: Eryops Books, Stephenville, TX, U.S.A.
Soft cover. Condizione: Good. ORIGINAL 1954 PUBLICATION; issued w/ paper covers; ex-library; light browning of leaves; o/w in good condition. Book.
Editore: Oklahoma Geological Survey., 1961
Da: Eryops Books, Stephenville, TX, U.S.A.
No Binding. Condizione: Very Good. Large folded sheet consisting of a base map and bibliography/references cited; ex-corporate library; in very good condition. Map.