Author: OEN ING SOEN
Title: The geology, petrology and ore deposits of the Viseu region, northern Portugal.
Description: 1958. Dissertation Univ. Amsterdam. 179 pp. 19 fig. (2 h.t. folding-out), 8 photoplts. h.t. 1 fold. & col. geol. map in back pocket. Orig. wrps. very good.

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