Author: KUENEN, P.H.
Title: The porphyry district of Lugano west of the Valganna.
Description: 1925, Leidsche Geol. Meded. I; pp. 127-185, 20 fig. 1 photopl. with microphot. h.t. 3 plts. h.t. with maps & sections folding-out. Plain new wrps. orig. extract, stapled, as such very good.

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