Brief an Kollege [Adolf Dyroff]
Straßburg, 04.12.1913 [4/XII [19]13]Brief an Kollege [Adolf Dyroff]
Straßburg, 01.11.1913 [1/XI [19]13]Brief an Kollege [Adolf Dyroff]
Straßburg, 13.11.1913 [13/XI [19]13]Brief an Kollege [Adolf Dyroff]
Straßburg, 04.12.1913 [4/XII [19]13]Brief an Kollege [Adolf Dyroff]
Straßburg, 06.01.1914 [6/I [19]14]Brief an Kollege [Adolf Dyroff]
Straßburg, 15.01.1914 [15/I [19]14]