Brief an Professor [Wilhelm Neuss]
Köln, 26.07.1940 [26. Juli [19]40]Brief an Professor [Wilhelm Neuss]
Köln, 18.08.1940 [18. VIII. [19]40]Brief an Professor [Wilhelm Neuss]
Köln, 20.12.1941 [20. XII. [19]41]Brief an Professor [Wilhelm Neuss]
Köln, 24.01.1942 [24.1. [19]42]Brief an Professor [Wilhelm Neuss]
Köln, 05.04.1944 [5.4. [19]44]Kaplan Karl Koch
Köln, 1945 [o.D. [1945]]