1852-1853 in Bethanien, Otjikango; letters and diaries from missionary holidays, 1848-1850; letters and diaries from Africa, also from Emmy Haupt (1854 married to Georg Zimmer), Gorth's bride, d. did not find him alive anymore, 1851-1853; transcript from "Hessische Biographien": "Gorth, Matthäus, Missionar, 1823-1853", edited by Hermann Haupt, Darmstadt, 1918; photocopy of the obituary for Matthäus Gorth in the reports of the RMG;

Records of missionary Carl Hugo Hahn, ms.; bound to the history of the station Neu-Barmen (Otjikango), the Herero people and Jonker Afrikaner; diaries about two journeys to Ovamboland, 1857 and 1866; diary about e. Reise zum Waterberg, 1871, 467 p. ms;

Correspondence, diaries and photos from the mission time in Togo 1890-1897, furthermore the main work of the friendly missionary and linguist Jakob Spieth.