Reise- u. Arbeitsberichte von E. Johanssen, 1925-1928; "Wieder auf dem alten Arbeitsfeld in Ostafrika, 1925; "Zur Erziehungskonferenz von Usambara nach Dar-es-Salaam 13 p., ms., 1925; "Meeting of indigenous priests in Mlalo, 1925; Reports and letters by Johanssen, Mörchen, Gleiss, Dr. Kröber, Hosbach, Scholten, Hagena and others, 1929; Report on Lutindi von Nickel, 1929; Reports by women on women's fates and women's work in Buhaya (see table of contents in the file), 1929
Evangelical Missionary Society for German East AfricaCollection of names of Lahaya women and explanations, 1939; clans and clan regulations of the Bahaya, by Mrs. A. Rascher, 30 p., ms., n.d.
Evangelical Missionary Society for German East AfricaCorrespondence, monthly and school reports, 1927-1933; vows of secondment and instructions, 1928; beginnings of secondary school work in the Bukoba area, 1929; necessity of a central school and the the first steps towards this, 1929; reflections on the introduction of American Negro songs in Africa, contained in correspondence at the end of 1929 and the beginning of 1930; The consecration of our Kigala Church on 4th Advent, 1930; From the Growth and Becoming of a Haya Community, 32 p. ms.., 1932; Zur Frage der Centralschule, 1932; Correspondence and reports by Otto Hagena, 1934-1943; Versorgungsangelegenheiten, 1937; Musik in der Heidenmission, answers to questionnaires, 1939; Lieder der Bahaya, 1939; Curriculum Vitae of Otto Hagena, 1943; Condolences and condolences. Commemorative speech on the death of Otto Hagena, 1943; correspondence with Adelheid Hagena, née Johanssen, 1943-1958; death notice of Adelheid Hagena, 1970
Evangelical Missionary Society for German East Africa