Phototype: Postcard (coloured drawing). Format: 13,7 X 8,6. Remark: addressed to A. Blumer, art publisher Walther Dobbertin, Dar es Salaam and Tanga, surface damaged.
Leipziger MissionswerkMedical questionnaires for Heinrich Waltenberg and Hildegard Bokermann (his bride), 1929; vows of the Evangelischer Afrikaverein for Heinrich Waltenberg, 1930; correspondence, reports and stories, also by Hildegard Waltenberg, 1930-1946; "Meine Ferienreise durch Usambara im Jahre 1947, 26 S., ms.; Accounting
Evangelical Missionary Society for German East AfricaVolume 4: Creation of a German-East African city order (18 July 1910) and its application to Dar es Salaam and Tanga
Phototype: Photo. Format: 22,4 X 16,7. Description: Ostrich on pasture fence, 2 European men, steppe landscape with Meru. Remark: Walther Dobbertin, art publisher, Dar es Salaam and Tanga, German East Africa. Reference: See Album 21, No. 813 (5.4 X 6.8).
Leipziger Missionswerk29.11.1940-07.12.1940, State Archives Hamburg, 113-6 State Administration - Wirtschafts-. Agricultural and social department