Contributions to solving the rubber problem in Cameroon Ajouter au presse-papier Fs 89/5499 Dossier vor 1912 Fait partie de German Historical Museum Foundation In: German Historical Museum Foundation Mittler & Sohn
Contributions to solving the rubber problem in Cameroon. Ajouter au presse-papier Fs 89/2875 Dossier um 1912 Fait partie de German Historical Museum Foundation In: German Historical Museum Foundation
Hot steam plough on cotton plantations in D e u t s c h -O s t a f r i k a Ajouter au presse-papier Fs 86/1323 Dossier vor 1911 Fait partie de German Historical Museum Foundation Brochure; Catalogue * In: German Historical Museum Foundation