Editore: Amer. Mus. Nat. Hist., New York, 1949
Da: Flora & Fauna Books, Gainesville, FL, U.S.A.
Prima edizione
Soft cover. Condizione: Fair. 1st Edition. Manual. 1949. Paper (7-3/4 x 10-5/8 in.), Pp. 347-388 (Bull. Amer. Mus. N. H., Vol. 93, No. 5). Overview of taxonomic methods and theory. Fair (text has a few page marks; cover worn, soiled and partially loose).
Editore: American Museum of Natural History, 1949
Da: Darkleaf Books, Arrington, VA, U.S.A.
Paperback. Condizione: Fine. Bulletin of the American Museum of Natural History: Volume 93, Artcile 5, pp. 343-388. 1951 reprint. Fine in original blue wrappers. Guidelines for biologists in the use of statistics.