Author: Casier, E., 1953.:
Title: Origine des Ptychodontes. [Mém. Inst. Roy. Sci. Nat. Belgique, Sér. 2, 49.]
Description: Bruxelles. Large 4to. Pp. 51,[5], 2 pls. of microphtooas of teeth structure, 12 figs., bibl., index. Orig. wrs., uncut.

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