Contains only: "Otavi copper in late autumn" - article of the "Deutsche Allgemeine Zeitung" of 25 June 1937

1892-1918 in Otjihaena, Gaub, Tsumeb; Letters, quarterly and station reports, 1891-1918; private letters to inspectors of the RMG, 1892-1900; letter from and contract with chief Kahimemua, 1892; printed municipal journal "Omahunge" in Herero language by Ferdinand Lang, 1900; application to d. Imperial Gouvernement in Windhoek for establishing 4 locations, 1902; medical testimony for Mrs. Maria Lang, née Müller, 1904; justification of Ferdinand Lang against accusations by missionary Friedrich Hermann Rust, 1906; legal dispute with the Otavi Mine and Railway Company, 1913; report by daughter Lydia Lang about the death of her parents, 1918; correspondence with the children Lang, 1942;

Contains among other things: Worker Relations in East Asia and on the South Sea Islands The Treatment of Asians in Foreign Colonies Work Regulations of the Otavi Mining and Railway Company, 1912

Contains among other things: Annual Report for 1906/07 of the Otavi Minen- und Eisenbahngesellschaft Denkschrift betr. Entwicklung der Schantung-Bergbau-Gesellschaft Investigations of rock samples, results of heating tests with Schantung coal Annual Reports of the Schantung-Bergbau-Gesellschaft for the financial years 1907/08 and 1908/09 and of the Deutsche Gesellschaft für Bergbau und Industrie im Auslande for 1908/09