COBBAN, W.A. & J. KENNEDY - Variation and ontogeny of Calycoceras (Proeuclaicoceras) canitaurinum (Haas, 1949) from the Upper Cretaceous (Cenomanian) of the Western Interior of the United States.

1990. US Geological Survey Bulletin 1881, B; iii, 7 pp. 4 plts. h.t. Orig. extract, stapled, very good, 4to.

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