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

1892-1904 missionary in New Guinea, home service, 1914-1937 home inspector; letters and station reports from Bogadjim and from journey home

Contains among other things: Map of the northern part of the Gazelle Peninsula, M.: 1:100 000 and Map of New Guinea, 1908

Contains among other things: South Australia. Government Resident's report on northern territory for the year 1890. Palmerston, 1890 G. Volkens, report on my trip to the South Seas. I. Part New Guinea, Bismarck Archipelago, Marshall Islands

Contains: Criminal case against the former police master Kaltenbach because of insulting

Contains among other things: Statute of the New Guinea Company, Berlin 1886