Brief an College [Carl Justi]
Königsberg, 18.07.1889 [18. Juli [18]89]Brief an College [Carl Justi]
Königsberg, 14.11.1891 [14 Nov. [18]91]Brief an College [Carl Justi]
Straßburg, 27.11.1909 [27.11. [19]09]Postkarte an Professor C. Justi in Bonn
Straßburg, 18.10.1894 [18 Oct. [18]94]Postkarte an Professor Justi in Bonn
Straßburg, 08.11.1894 [8. Nov. [18]94]