Author: Urbanek, A., & Towe, ,K., 1974.:
Title: Ultrastructural studies on graptolites, I: The periderm and its derivates in the Dendroidea and in Mastigograptus. [Smithson. Contr. Paleobiol., 20.]
Description: Washington 1974. 4ro. Pp. iv,48, several microphotos on 30 plates, 2 figs., ,refs. Orig. wrappers.

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