WESTERVELD, J. - On the origin of the acid volcanic rocks around Lake Toba, North Sumatra. A further contribution to the knowledge of welded rhyolite-tuffs ... etc.

1947. Verh. KNAW, Afd. Nat. (II) XLIII-1; 51 pp. 5 photoplts. h.t. 1 fold. pl. with geol. map. Orig. wrappers.

EUR 15.00 [Appr.: US$ 16.15 | £UK 12.75 | JP¥ 2541] Book number 9050239

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