Colonial 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)