Author: WENGER, CH. ET AL.
Title: Karte der Vorkommen mineralogische Rohstoffe der Schweiz 1:200.000 Blatt Tessin-Uri. [Erläuterungen met Karte].
Description: 1990. Schweiz. Geotechn. Komm, Zürich. 114 pp. many figs. 1 fold. & col. maploosely inserted. orig. wrps. with libr. stamp, conntents very goo, 4to.

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