Author: Cobban W.A.,
Title: Scaphitoid cephalopods of the Colorado group
Description: 1951. In 4to, original wrappers, pp. 89 with 21 pls., 4 figs. and 1 insert. Geol. Surv. Prof. Pap., 239. Ex Library stamps and ticket but a very good copy. The evolution of Scaphites and related genera

Keywords: shells fossil ammonites paleontology geology


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