Author: Porro, C., 1933.:
Title: Dal Pizzo dei Tre Signori al Monte Ponteranica (Alpi Bergamasche-Valtellinesi). Studio geologico. Mem. Ist. Lombard. Sci. Lett., Cl. Sci. Mat. Nat., 22(5).]
Description: Milano: Ulrico Hoepli. Folio, 31cm. Pp. [iv],152, 25 figs., 3 tipped-in fold. sections, 12 photos and 2 figs. on 7 pls., 1 fold. pl. of sections in pocket, bibl. Old cloth-backed boards, orig. printed front cover mounted. - Without the geological map.

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