Letters to teacher Küchler from Lutindi, especially from Katakula 1899-1902, Mjomba, 1901-1902, Samuel Stepke, 1901-1902; Letters to Missionary Rösler especially from:; Lazalo Shauli, also diaries and other articles Hosbach's statements on Shaulis death, 1905-1923; Silas, 1905; Tito Hiza, n.d. ; Mfuzi Solomo, 1915; Mfuzi Daudi, 1916; Jeremias Kika, 1915; Job Kunyonga, 1914; Luka Sefu, 1914 u. 1918; Johana Mtungasi, 1913; Ruben Mutangi, 1914 and 1916; Enea Mutunguja, 1914 and 1917; notes by Jakobo Ngombe on experiences during and after the war, 1914-1923; letters by Jakobo Ngombe to Hosbach and Gleiss, 1925-1927; letters to Missionary Gleiss and student essays, 1921