1913 2 volumes (text + atlas). 89 p., 16 figs, 22 pls, 1 folded table, 8vo (text) / large 4to (atlas), red hcalf with marbled boards (text) / original hcloth portfolio (atlas). Mededeelingen van 's Rijks Herbarium Leiden / Mitteilungen aus dem geologischen Museum des Westfälischen Berggewerkschaftskasse, Bochum. Ex library Dr. H.W.J. van Amerom.First 14 pages in xerox-photocopy!
1915 23 p, 14 figs, 2 folded plates, 4to, modern green half cloth. Library stamps. The four complete issues of ‘’Glückauf. Berg- und Hüttenmännische Zeitschrift’’ in which these papers were published are here bound together. Rare.