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];

The written estate (9 boxes, 1 large-format folder) contains working materials, travel and excursion diaries, manuscripts, publications, bibliographic index, correspondence with family, friends, acquaintances, colleagues, publishers and other institutions, personal and professional documents, a small proportion of the collection and partial estates of the wife Eva Schmieder (née Pelet), the daughter Elma Schmieder (later: Behrens) and the mother-in-law Maria Pelet. - The extensive photographic estate (10 boxes) contains mostly photographs by Oskar Schmieder, but also partly by other photographers. The photographs were taken in connection with publications, excursions, professional and private journeys, as well as in a family context. The photographic legacy is merely pre-arranged, roughly indexed and contains numerous duplicates.