Author: Spicher, A., 1940.:
Title: Geologie und Petrographie des oberen Val d'Isone (südliches Tessin).
Description: Schweiz. Miner. Petrogr. Mitt., 20: pp. 17-100, 1 fold. col. map with col. sections, 3 figs., bibliogr. 8vo. Offprint, orig. wrappers. Perforated stamp to front cover and blank margin of first two leaves, very good otherwise.

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