Author: COBBAN, W.A. & J. KENNEDY
Title: Pachydesmoceras Spath, 1922, a Cretaceous ammonite from Colorado. plus 5 other papers on Cretaceous ammonites and one on rudistids
Description: 1991. US Geological Survey Bulletin 1885, A-F; xviii, 30 pp. figs. 14 plts. h.t. Orig. wrps. with libr. ticket, very good, 4to.

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