Correspondence, mainly private, to Pastor Bodelschwingh and the Brothers of the Convent, 1893-1903; correspondence, especially with Inspector Walther Trittelvitz, 1911-1946

Nachlaß:; Fotokopien von maschinenschriftlich übertragenen Briefen u. Abschrift d. Testamentes, 11 p.; Newsletter to the missionaries working with Carl Ludwig Hegner in Africa: "How far may the newly arriving missionary give room to the first impressions and disappointments?"1867; Letter of reply of Carl Ludwig Hegner, after the letter was circulated, 8.9.1867; Letters of Carl Ludwig Hegner to Inspector Friedrich Fabri and Ludwig von Rohden concerning matters of marriage, 5 letters from Pella, 1867-1869; elaboration on the awakening of spiritual life, signed I.N.J.A.., 1875; last will and testament, 1913;

Private letters and telegrams from numerous personalities in mission and church service to Insp. Johannes Wilhelm Karl Spiecker during his trip to Africa

Letters and reports by Johannes Wilhelm Karl Spiecker; Instruction for Johannes Wilhelm Karl Spiecker, 1902; Reports from South Africa, 1902; Welcome by the schoolchildren of Stellenbosch, 1902; Case files Heinrich Philip Christian Stremme, 1903; Forms for lease agreements, 1903; Johannes Wilhelm Karl Spiecker's private letter to Insp. August Schreiber: Journey to Damraland, 1903

1885 seminar teacher, from 1889 2nd inspector, 1st inspector 1908-1920[from 1909 designated as director]; Vokation as teacher at the mission seminar, 1885; Greetings to the Brothers in the Mission, 1885; Farewell sermon Herchen Church/Sieg, Dr., 1885; Description of the duties of the 1st inspector, 1903; Fr. Karl Krafft to him, 1906; Determination of income, 1907; Reports of illness on the journey in Padang/Sumatra, 1911; Prof. Mirbt on travel impressions in South-West Africa, 1914; Correspondence, 1910-1915; Notice of Deputation, Dr., 1920; Correspondence with family, 1920-1963

Memorandum by Inspector Trittelvitz on "The situation of our missionary society as reason for the inspectors' application to unite our mission with the Rhenish Mission, 10.02.1903; Concerns against the request of the missionary inspectors regarding the dissolution of Berlin III and the handing over of our stations to Barmen, 22.02.1903; "How should our relationship with the Rhenish missionary society and the Ravensberger Land develop in the future? By Inspector Trittelvitz, 13.06.1912