Author: Oen, Y.S., 1958.:
Title: The geology, petrology and ore deposits of the Vizeu region, northern Portugal. [Comun. Serv. Geol. Portugal, 41.]
Description: Lisboa. 8vo. Pp. 199, 8 pls. of photos, 1 mlarge fold. col. geol. map in pocket, 19 (3 fold.) figs., refs. Wrs.

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