Author: Preiswerk, H. and A. Werenfels
Title: Beiträge zur geologischen Karte der Schweiz. Geologische Beschreibung der Lepontinischen Alpen. Parts I-III.
Description: Bern, Francke, 1907-1924. Three parts in three. 4to. 125 pp., four coloured maps and two coloured profiles and several b/w profils in the text. Original printed wrappers. = This monograph (# 26 of this series) contains: 1) H. Preiswerk, Die Grünschiefer in Jura und Trias des Simplogebietes, 2) H. Preiswerk, Oberes Tessin- und Maggiagebiet, and 3) A. Werenfels, Geologische und petrographische Untersuchung des Vispertales. Original wrappers mostly torn and loose, however internally fine. Only the first issue has a stamp on the title page.

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