Letters addressed to Trittelvitz personally, especially from mission members from Africa, 1899-1911; "Kindergabe vom April 1901; Afrika-Reiseberichte von Trittelvitz from 1904-1905; Visitationsbericht, bound in Hohenfriedeberg, 1905; Brief von Friedrich von Bodelschwingh zum Verhältnis der EMDOA - Bethel, 1899; Memorandum Trittelvitz zum Zusammenschluss Bethel u. Barmen, 1903; Statement on the takeover of the mission in Japan, 1905; correspondence from Trittelvitz with the missionaries Ruccius, Gilsdorf, Ostwald, Gleiß, u.a. on questions of music, questions of marriage, Bible translation, 1901-1904; correspondence Trittelvitz - Michaelis, 1904-1905; contract of service Trittelvitz, 1909; correspondence with Held and others. Ronicke, 1908-1948; Information about the fate of missionaries in the field and in internment, 1940-1948; private correspondence with Gustav von Bodelschwingh, 1895-1946; "Father von Bodelschwingh and his work, 70 p. ms, ca. 1945; Obituary for Sister Mathilde Wegener, 1945; Correspondence from the last years of life, death announcement and condolences, 1950-1958; Correspondence Lina Trittelvitz, death announcement, condolences, 1958-1963
Bethel-MissionCorrespondence, 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
Bethel-Mission