BIRKELUND, T. & H.J. HANSEN - Shell ultrastructures of some Maastrichtian Ammonoidea and Coleoidea and their taxonomic implications.

1974. Kon. Danske Vidensk. Selsk. Biol. Skr. 20, 6; 34 pp. 7 fig. 16 plts. h.t. Orig. wrps. very good.

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