1868-1903 in Otjikango, Okahandja, Otjosazu, from 1903 home service, from 1915 parish office; letters and reports from work with the Hereros, 1869-1903; annual reports, cash reports of the Otjosazu station, 1872-1903; manuscript: "Die Oupanga d. Ovaherero", 1891; reports by the evangelists Paul, Gottlieb and Manasse, 1893; private letters, also from Mrs. Hedwig Irle, née von Rohden, to the inspectors at the mission house, 1893. Inspectors in the mission house, 1890-1902; reports from the work in the home service, 1905-1922; correspondence of the RMG with members of the Irle family, 1922-1960; letter from Gottlieb Murangi, Windhoek, to Mrs. Hedwig Irle, née von Rohden, 1930;