Brief an College [Adolf Dyroff]
Münster (Westf), 11.01.1916 [11.I. [19]16]Brief an Kollege [Adolf Dyroff]
Münster (Westf), 13.07.1916 [13.7. [19]16]Brief an Kollege [Adolf Dyroff]
Münster (Westf), 17.04.1924 [17.IV. [19]24]Postkarte an Univers.-Prof. Dr. A. Dyroff, Bonn, Richard-Wagnerstr. ?
Münster (Westf), 16.07.1916 [16.7. [19]16]