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Letters and reports from New Guinea, 1889-1892; paper "What dangers do the accumulation of plantations pose to our people and what tasks do they pose to missionaries? ca. 1892; Report by Elli Arff, née Schumacher, on the last days of her husband's life, 1893; private letters to inspectors of the RMG, also by Elli Arff, 1890-1894; A letter by missionary Johannes Barkemeyer from Siar to the RMG, 1894; letters by Elli Arff from New Guinea, 1893-1894