Medical certificate for married couple Nickel, 1925; Correspondence, 1926-1959; Curriculum Vitae, 1926; Circular(s) to Lutindi-Freunde, 1926; Month- and. Annual reports from Lutindi, 1927-1938; letter of the German Archives Office in Dar-es-Salaam concerning the transfer of property Lutindi of the Evangelischer Afrikaverein, 1928; plans for the extension of the lunatic asylum in Lutindi, 1929; photo of the new building in Lutindi, 1930; report on the death of Hermann Kanafunzi, 1930; various documents from the work in Lutindi, 1931; medical testimony of the married couple Nickel, 1932 u. 1939; Confidential correspondence concerning the personality of Wilhelm Nickel, 1938-1939; death announcement for Wilhelmine Nickel, 1960; death announcement for Wilhelmine Nickel, née Diehl, 1962