Philadelphia, 1912. In-4 gr. (mm. 343x263), mz. pelle mod. con angoli, pp. 23-112, con 9 grandi tavole accompagante da testo esplicativo. Estratto da Journal of the Academy of Natural Sciences, 1912. In buono stato (good copy).
Reference : 59993
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1925 250, 6 p., 43 pls, paperbound (original printed covers, probably formerly hardbound, but ''hard covers'' removed). Published in: Bulletins of American Paleontology. Scarce.A well-illustrated monograph in which numerous new species were described.