Various excerpts from Carl Hugo Hahn's diaries and letters, thematically summarized typoscripts, probably by Dr. Heinrich Vedder in the 1920s:; Chronological Notes, 1841-1867; Kleine Notizen u. Briefaauszüge, 1844-1855; Carl Hugo Hahn u. d. Wesleyaner, 1844-1855; Missions-Kolonisation, 1863; Buren Immigration u. Augustineum, 1869; Die Friedenskonferenz zu Schmelens-Expartung (Okahandja), 1870; Wie Jonker Afrikaner mit d. Damaras geme gekommen, 1873; Heimreise, 1873; Correspondence with descendants of Carl Hugo Hahn, 1904-1943; copy of the doctoral diploma of the University of Leipzig for Carl Hugo Hahn (1874), 1954;
Rhenish Missionary SocietyEnthält u.a.: Territory of South West Africa. Report on the census of the European population. Taken on the 4th May, 1926. Pretoria, 1927. Deutsche, Buren und Engländer in Südwestafrika. Sonderdruck aus "Koloniale Rundschau" Heft 9/10, 1931.
Contains among other things: Contract between the governor Leutwein and the commander of the Boers living in Grootfonthein, Lombaard 1895 Boer immigration to German Southwest Africa. Memorandum of the All German Association, Berlin 1900
Letters, reports, invoices, 1901-1910; So-called "Burensache, i. e. the employment of two Boers from Transvaal, father and son of Folker, who could not return to their homeland, 1902-1903; "Baptism of the first fruits of Gombero, December 1906; Plan of the Mission House in Gombero (Digo), 1907; Call to Organize a German Protestant Church in Tanga u. in the hinterland, printed flyer, 1909; A copy of the "Usambara-Post with an essay by Delius about "Die deutsche evangelische Kirchengemeinde von Tanga u. Hinterland vom September 1909
Evangelical Missionary Society for German East Africa