Correspondence, travelogues, circulars, work reports, 1930-1938; curriculum vitae, instructions, vows of delegation, 1932; "Von afrikanischen Jungs - wie sie spielen, 1933; "Fahrt nach Bumbire, 1933; 2 Lieder in Kisuaheli - Texte u. Noten von Friedrich Caesar, 1934; "Von den Wundern Afrikas, 1934; "Sterbendes Land? 1934; "Safari in Kisiba, 1935; "Schwarze Mitarbeiter, 1937; Protocol of the Synod in Kigarama, 1939; curriculum vitae, service instruction, vow of deputation by Grete Hinck, married to Caesar, 1938; Bethel Song by Walther Trittelvitz, 1938; Report on Ihangilo, 1939; Form of Parole, Tanganyika Territory, 1939; Official correspondence by Friedrich Caesar during internment, 1940-1946; Private correspondence with and. about Caesar and her husband in internment, 1940-1947; correspondence with Caesar and her husband in their homeland (Quedlinburg and Bielefeld), 1948-1991; life insurance matters, 1959; letters and travel reports from Tanzania, 1973-1974
Evangelical Missionary Society for German East AfricaInstruction, vow of secondment and personal data, 1927; correspondence with Sister Luise in Bumbuli and Mlalo - during internment and in her homeland, 1927-1963; death announcement for Luise Dieker, 1964
Evangelical Missionary Society for German East AfricaCurriculum vitae, 1928; instructions and vows of deputation, 1929; correspondence during her internment and later at home, 1927-1967; mission reports, 1929-1939; annual report Kijunja, 1932; circulars to godparents and friends of Haya girls, 1933-1939
Evangelical Missionary Society for German East AfricaCorrespondence with the Missionary Brothers and Sisters and the Home Administration, 1914-1915; Correspondence with various local persons and imperial authorities because of the war events, 1914; War Reports by D. Delius, 30.10.1914-20.12.1914; Order for the field service in Moshi, Christmas 1914; collection of special sheets of the "Usambara Post on Austria's declaration of war in Serbia and the war situation in Germany and East Africa, August 1914; Official announcement of the district official Köstlin in Wilhelmstal, 1914; "The Battle of Tanga, report by S. Delius, November 1914
Evangelical Missionary Society for German East Africa