Author: Calker, F.J.P. van, 1908.:
Title: Beiträge zur Geologie der Provinz Groningen. Grundbohrungen.
Description: Mitt. Miner.-Geol. Inst. Reichs-Univ. Groningen, 1(2): pp. 31-203, 6 fold. pls. of (mostly columnar) sections, 1 fold. plan, 1 fold. map, many tabs. in text. Large 8vo. Journal issue, orig. printed cloth-backed boards. Title-page stamped, good otherwise.

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