[Ev. Missionsgesellschaft für Deutsch-Ostafrika/EMDOA - since 1920: Bethel-Mission]; Correspondence and agreements on a planned cooperation between Berlin III and RMG

1870-1872 teacher at the Seminar d. RMG, 1873-1880 in Otjimbingue, 1880-1887 pastor in Königsberg, 1887-1889 inspector of the East Africa Mission and lecturer at the Oriental Seminar Berlin III; Letters and Reports, 1872-1880; Protocoll about the abolition of the forging of the Mission Colony Otjimbingue, 1874; Regen im Damralande, 7 p., hs., 1875; Löwengeschichten, 10 p. hs..., 1875; Sociale Verhältnisse im Hereroland, 36 p., hs., 1876; Die Bergdamra, 16 p., 1877; Wege im Damaraland, 16 p., 1877; 2 letters of J. Chr. Goliath from d. Augustineum, 1877; The Augustineum in Otjimbingue, 5 p.., hs., 1877; school visit in Hererolande, 20 p., hs., 1879; church consecration in Scheppmannsdorf, 10 p., 1879; September 1990 preserved: Personal Diarium of Büttner from the years 1867-1871; biographical material on Büttner (copies) by Prof. Ernst Hans Dammann;[Büttner's letters contain interesting information on the Mission Trade Society and on political conditions in Southwest Africa, see also Bethel Mission];

Correspondence on missionary activity in East Africa; Memorandum "The Relations of the Bethel Mission to Rwanda by Curt Ronicke (?), 26 p., ms., 1932; Reports on Living Conditions in Internment Camps and Letters from Internees, 1939-1944; Settlement of Grants for the Hospital in Bumbuli, 1963

Handwritten report on the founding of the EMDOA on 26 October 1885; "Die Genesis der Deutsch-Ostafrikanischen Evangelischen Missionsgesellschaft, Werbeschrift, Druck, 8 p., 1886; Literaturhinweise zur Geschichte der Bethel-Mission, 1972, 1 sheet, ms.