Brief an College [Carl Justi]
Straßburg, 01.12.1887 [1.XII. [18]87]Brief an College [Carl Justi]
Straßburg, 13.05.1891 [13.V. [18]91]Brief an College [Carl Justi]
Straßburg, 14.05.1891 [14.V. [18]91]Brief an College [Carl Justi]
Straßburg, 07.12.1890 [7.XII. [18]90]Brief an College [Carl Justi]
Leipzig, 05.12.1892 [5.XII. [18]92]Postkarte an Dr. Carl Justi in Bonn
Straßburg, 08.02.1891 [8.II. [18]91]Postkarte an Prof. Dr. C. Justi in Bonn
Straßburg, 13.06.1891 [13.VI. [18]91]