Engineer, 1898-1900 in Otjimbingue, later professor in Poznan/West Prussia; correspondence, expert opinions, reports on the improvement of water supply and farm management, 1898-1900; instruction for Walter Borchardt, 1898; Friedrich Wilhelm Gottlieb Viehe on Walter Borchardt's plans for a new water supply system, 1898-1900. d. Bewirtschaftung von Gaub, 1900; Plan sketch of Otjimbingue, 1:100,000 (damaged), 1899; Map sketch of Gaub, 1899; Profil e. Test drilling for e. cattle drinkers in Otjozonjupa, 1899; Letter of the daughter with death announcement, 1938;

Minutes, circulars, annual accounts; international revival correspondence. Cooperation; Meeting of the Continental Missionary Conference, Dr., 1913; Minute of International Missionary Meeting, Schloss Crans/Geneva, 20 p., Dr. June 1920; Paul Hennig: 1 official 1 confidential report on meetings at Schloss Crans, 1920; Axenfeld: Letter to J. Mott, 17 p., ms., June 1920; J. Richter: Before heavy decision, 4 p., Dr., 1920

Correspondence, reports and newsletters; The Bukoba Anniversary Celebration (25 years); Letter from Andrea Kajejero (original and transmission); Map of Bukoba with the stations drawn in; minutes of the main Lucco Nahamba-Ihangiro (December only)

1895-1900 in Rietfontein, Warmbad, Pfarramt USA et al. in St. John's Luth Church, Campbell Hill, Ill.; letters and reports, 1895-1900; curriculum vitae, ca. 1890; private letters to inspectors of the RMG, 1895-1900; What can we learn from the Good Samaritan for our mission, paper, 1899; letter about his departure from Mission, 1900; letters from Campbell Hill, Illinois/USA, 1921-1922;

Request for information on [Victor] Ehrenberg regarding a second Ordinariate for National Economy; report on different views within the Appeals Commission (reliable vs. superficial writer); request for feedback on his judgement on [Ludwig] Pohle until the meeting on July 3.

Report on the Geographical Congress in Paris

Letters, circulars, reports from Bukoba and Kijunja by Maria Fröhlich, 1929-1935; circulars by W. Hosbach, Brothers and Sisters number 1-7 by H. Scholten, 1934; letter by Christiane Blasyo Kashasha, 1934; letter by Josua Hermas, 1934; letters and cards by Martha and Wilhelm Hosbach, 1949-1958

Station and annual reports; cover letter to d. Minutes; Correspondence with W. Coates Palgrave, 1878; Requests to Deputation, 1880; Colloquium for the Ordination of Christian Philipp Johann Baumann, Sermon by Christian Philipp Johann Baumann, 1880; Complaint to the English Consul for Attacks in Walvis Bay, 1881; Report on the Peace Conference on Rehoboth, 1882; Letter from Maharero, 1882

Curriculum Vitae of Paul Döring, 1893; Correspondence, travelogues and diary excerpts, 1893-1902; "Auf den Ruegern Wugas (Report), ca. 1901; Correspondence, reports and diary excerpts, 1902-1929; Letter from Andrea Kajejero, 1924; Annual Report of Neu-Bethel, 1908-1909; Correspondence with Elisabeth Döring (wife), 1950-1954

Curriculum vitae, certificates and health certificate, 1888-1889; Instruction, 1892; 2 private letters to Inspector Spiecker, 1892; letter and a report from New Guinea, 1892; Johann Pillkuhn (father) to RMG in inheritance matters, 1893