'The North German Missionary Society in Bremen avoids the mission territory in Togo. - Report by the Grade Secretary for the attention of the Foreign Office - Including: - Presentation of the situation by the German Missionary Society in West Africa by the Foreign Office according to information from Mission Inspector Zahn
Gouvernement von KamerunColonial quarry: "Tagebuch 1885-1886; Central Afrika. XIII. Heft", Handwritten and typed copies of one of Wolf's diaries (December 12, 1885 - March 17, 1886) in which he describes Luluabourg, a newly built and already prosperous city (rice plantations, manioc, corn, beans, groundnuts and sugar cane), his interviews with Chief Kalamba, his passage to the station of Luebo, his embarkation on the En Avant with the aim of going up the Sankuru to the future Lusambo (confluence of Lubi-Sankuru), then his discovery, upstream of Pania-Mutombo, of the falls that will bear his name. Documentation: Photo-portrait (1887); Announcement and article on the death of Ludwig Wolf (1889)