Author: Lehmann, W.M., 1957.:
Title: Die Asterozoen in den Dachschiefern des rheinischen Unterdevons. [Abh. Hess. Landesamt. Bodenf., 21.]
Description: Wiesbaden. 8vo. Pp. 160,[110], numerous photos on 55 plates (some fold.), 31 figsd., bibliogr., taxon. index. Orig. wrappers.

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