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Hand-excerpts of his works, manuscripts, printed matter, photographs from New Guinea; chronicle of the Neuhaus family is missing
Official Instruction, 1912; Correspondence (also from prisoner of war in Egypt), 1911-1919; Health Certificate, 1923; Letters and Reports from Rosario in Argentina, 1924-1925; "Call for cooperation in the states of South America by Johann Ick as print, about 1922; Plans of the printing works in Rosario, 1924; Letters and reports from Rosario, 1924; Letters and reports from Rosario in Argentina, 1924, 1911-1925. Reports from Vuga in East Africa, 1926-1940; "Ufalme Wa Mungu(In English: The Kingdom of God) Number 17, two copies printed in July 1928; "Die Missionsdruckerei in Vuga (Druck), 1931; Medical testimonies of the Joppe family, 1938 and 1942; Correspondence, 1940-1959
Evangelical Missionary Society for German East Africa