Contributions to solving the rubber problem in Cameroon Add to clipboard Fs 89/5499 File vor 1912 Part of German Historical Museum Foundation In: German Historical Museum Foundation E.S. Mittler & Sohn
Hot steam plough on cotton plantations in D e u t s c h -O s t a f r i k a Add to clipboard Fs 86/1323 File vor 1911 Part of German Historical Museum Foundation Brochure; Catalogue * In: German Historical Museum Foundation
