Author: Landman, N.H., 1987.:
Title: Ontogeny of Upper Cretaceous (Turonian-Santonian) scaphitid ammonites from the Western Interior of North America: systematics, developmental patterns, and life history.
Description: Bull. Amer. Mus. Nat. Hist., 185(2): pp. 117-241, many photos, figs. and diagrs. in 82 illus. in text, tabs., refs. Offprint, orig. wrs.

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