Author: Langsdorff, W., [c. 1885].:
Title: Uebersichtskarte des Gangsystems des südwestlichen Oberharzes.
Description: Clausthal: H. Uppenborn. Chromolith. geological map, scale 1:100,000, meas. 23x33cm + broad margins with legenda, folding into orig. cloth-backed printed boards covers of small 8vo size.

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