large drawing of the church in Walvis Bay by J. C. Pingel, c. 1910; plans for the reconstruction of the mission station, by Ludwig Koch, agent of the RMG, no year; statistical questionnaire, 1946-1969; correspondence for the church in Walvis Bay, 1960; thanks to Kirchengemeinde Bielefeld for donation to the kindergarten, 1965;

Contains among other things: Sketches of the sleeping concentration camp Usumbura, of the main camp Niansa, of the occurrence of Glossina palpalis and Trypanosamiasis in the district Usumbura, 1908; sketch of the trip of the staff doctor Dr. Breuer at the Niassasee and at the Rikwasee, 1908