1877-1900 in Otjikango, Omaruru, Otjimbingue, housefather in the Mission House, 1903-1913; letters, station and quarterly reports, travel reports, 1877-1899; quarterly reports from 1897, also signed by Johannes Olpp; private letters to Inspectors d. RMG, 1882-1899; Invoices for building materials and municipal accounts; Letter from Hendrik Witbooi, Rooibank to Freerk Meyer, 1891; Police Ordinance on smallpox, 1891; Report from d. Commemoration of the 25th anniversary of the church in Otjimbingue, by H. Kleinschmidt, 1892; Description e. Begegnung mit Hendrik Witbooi (1. Quartalsbericht), 1892; Contract with the school board of the German mission school Otjimbingue, 1895; Question by Mr. von Lindequist about harmful influence of spiritual beverages on the natives, 1896;