1907-1923 in Warmbad, Keetmanshoop, Windhoek, Heimatdienst 1923-1927, parish office from 1927; letters and reports, 1907-1946; curriculum vitae, application, recommendation, 1902; examination certificate (copy), 1907; Henriette Fenchel, later Mrs. Becker, to Warneck and Johannes Spiecker, 1909 1910; report on Tobias Fenchel's illness and illness. Death, 1910; Engagement announcement Gustav Becker - Henriette (Henny) Fenchel, 1911; Agreement between the RMG in Barmen and the Evangelische Verein für Innere Mission in Nassau, 1924; Report by Ms Henriette (Henny) Becker "In Memory of my dear husband Gustav Becker", 3 p.., ms, 1948; Obituary for Gustav Becker, 1948; Correspondence with Mrs Henriette (Henny) Becker, 1948-1967; death certificate for Mrs Henriette (Henny) Becker, 1968;

1903-1951 in Berseba, Keetmanshoop, Swakopmund; letters and reports, 1903-1958; curriculum vitae, certificates, medical certificate, 1894-1903; obituary for Mrs. Elfriede Eisenberg, née Schmitz, 1956; obituary for Friedrich Gustav Eisenberg, 1958;

1865-1905 in Spektakle, Pella, Concordia, Keetmanshoop, Berseba, missionary from 1905; curriculum vitae, 1858; letters and travelogues (partly with additions by Johann Georg Krönlein), annual reports, visitation reports, conference reports, 1865-1905; request of the. Federal Foreign Office Berlin for awarding the Order to Carl Ludwig Hermann Hegner, 1906; letters from his retirement, 1907-1913; correspondence with Ms. Zimmermann, née Hegner 1955

1906-1948 in Bethanien, Windhoek, Keetmanshoop; letters and reports, 1906-1946; curriculum vitae (2 versions), certificates, correspondence of the aspirant Wilhelm Albert Peter, 1895-1900; birth certificate (copy), certified, 1908; protocol on language examinations in Nama by Wilhelm Albert Peter, 1913; regulation d. Pension and care case for Olga Peter, née Hak, 1948-1954; correspondence with Olga Peter and Erich Otto Peter (son), 1948-1954; obituary for Olga Peter, 1954