Editore: USGS Professional Paper 186-N, 1936 (1937), pp. 273-299 + folded map., 1937
Da: Eryops Books, Stephenville, TX, U.S.A.
Soft Cover. Condizione: Good. ORIGINAL PUBLICATION; Softcovers; wraps chipped/torn around edges w/ large chip missing from lower corner of front wrap; front wrap foxed along edges; minor shelfwear w/ light creasing of corners of pages; contents in good condition.