Editore: Tulsa Geological Society., 1934
Da: Eryops Books, Stephenville, TX, U.S.A.
No Binding. Condizione: Very Good. ORIGINAL Articles, disbound from journal; no covers; in very good condition. Journal.
Editore: Okla Geol Surv, 1925
Da: Larry W Price Books, Portland, OR, U.S.A.
Paperback. Condizione: Very Good. Bull 31, 32 pp.+ FoldOut at back, Orig Blue Paperback, VG.