Correspondence and Reports, 1910-1917; Report on the current situation and the most important problems of the Rwanda mission by Missionary Roehl, 27 p., ms., 1913; Conference Protocols, 1928-1938; "Church Mission Society and Bethel Mission in Bukoba von Johanssen, 23 p., ms..., 1929; Discussion with Oldham about division of territory, 1930-1931; Minutes of a meeting of the mission societies working in East Africa on 04.07.1932 in Dresden, 1932; The Jubilee Year of our mission society of H. Scholten, 39 p., ms. 1936; "Gedanken zur Begründung einer Eingeborenenkirche Buhaja von H. Scholten, 19 p., ms., 1938; Gemeindeordnung Buhaja, n.J.; Ordnung der Gemeinde- u. Kirchenvertreter-Versammlung in Buhaja, n.J.; Kirchenzuchtordnung, n.J.; Kartenskizzen, n.J.

Statistical material on church, school and medical work in Bukoba, 1926-1938; statistical material on church, school and medical work in Digoland and Usambara, 1932-1939; statistical material on the work of the Bethel Mission, 1949-1970