1882-1884,1889-1903 Teacher at the Missionary Seminary, 1903-1923 2nd Inspector, 1923-1926 Director; Letters to Schreiber, 1897-1900; Letters to Haussleiter, 1906; Letters to Spiecker, 1908-1912; Messages to the Friends of the Fallen Son Walter, 1915; Vocation Certificate to the Director, 1924; Application for Retirement, 1926; Proposals for the Redesign of d. Dezernate, 1927; Vedder/Okahandja to Kriele, 1927; Pönnighaus/Windhuk to Kriele, 1927; Linden/Tungkun to Kriele, 1927; To J. Warneck, 1930; Correspondence of the Directorate with him, 1927-1937; Obituary, 1937; Correspondence with the Family, 1937-1958; Mitteilungen d. Rhein. Association for Medical Mission, 1959: enth. Appreciation E. Krieles and Dr. J. Winklers