Correspondence: Letters exchanged with various people including H.M. Stanley (1881-1882), Letters, instructions and notes from Strauch to Lindner (1880-1882 and end of 1883-1886), from Strauch to Stanley (1881), Correspondence and miscellaneous papers relating to his missions in China (1900-1908); Various : Copy of his contract of engagement with the Bas-Congo Studies Committee, signed by Strauch (19 August 1880), Manuscript extracts from several works in which Lindner's activities are mentioned; Notes on his trip to China (1908); Drawings: Lindner's sketchbooks on Congo (1881-1882), sketchbook (landscapes, objects, wildlife, 1881-1882); Photographs : Photos of Congo, Zanzibar, China and Japan; Maps : Maps of Chinese cities (Soochow, Nanking) and the Beijing-Hankow railway;