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
Rheinische MissionsgesellschaftVol. 1; Letters and Reports from Siar, 1900-1904; General Report of the New Guinea Mission for 1900 (1901); Conference Report on the Establishment of a Health Station, c. 1901; Conference Paper "The Importance of Literature among a Literature-less People! 1901; condolence of the imperial governor to Bergmann's death, 1904; correspondence with the German Foreign Office in Berlin for seduction of a Papuan girl by a German official, 1902-1904; correspondence with and for wife Karoline Bergmann, née. Ott, 1931-1950; Ein Brief des Siar-Christen Bel an Frau Bergmann, 1950; Obituary for Karoline Bergmann, with letter of condolence, 1952; Vol. 2; Letters and Reports from Siar (circulars, travel letters etc.), 1888-1896; Vol. 3; Letters and. Reports from Siar, 1896-1898; private letters to inspectors of the RMG, 1887-1900; letter from Missionary Bamler from Tami to Gustav Bergmann, 20.09.1896; vol. 4 Nachlass; Bergmann to his parents and siblings, 1880-1897; program of the memorial service for housemother Busch, 1886; comparison of words of the Siar- and. Bogadjim language, not published; Karoline Bergmann to the Bergmann family, 1887-1893; various correspondence to the Bergmann and Ott families, 1887-1946; Ida Helmich to Karoline Bergmann and son Theo, 1906; report on the first christening ceremony at Siar Ragetta, 1906; letters from Papua school children to son Theo, 1906
Rheinische MissionsgesellschaftLetters to Cap colony, Nama and Hereroland, New Guinea and China
Rheinische MissionsgesellschaftHe received from Australia: 1. herbarium australe, australian phanerogams, cent. A u, B; 2nd Filices of the Samoa Islands ca. 120 different species. Each collection is available in several volumes. 25 m a centurion. He'd trade too.
Sends copy of a letter from Heinrich Zahn from New Guinea about pitches in the Papua languages. Looks thus relationship to the Central African languages confirmed.
Ask Ehlers whether the Göttingen Museum is interested in the scientific objects he collected on New Guinea and the surrounding islands.