Brief an Kollege [Erich Rothacker]
Berlin, 15.08.1922 [15.8.1922]Brief an Kollege [Erich Rothacker]
Berlin, 09.09.1922 [9/9. [19]22]Brief an Kollege [Erich Rothacker]
Berlin, 02.08.1933 [2.8. [19]33]Brief an Kollege [Erich Rothacker]
München, 09.09.1943 [9. Sept. [19]43]Brief an Kollege [Erich Rothacker]
München, 04.11.1921 [4.XI. [19]21]Brief an Kollege [Erich Rothacker]
Berlin, 1922 [o.D. [1922]]Brief an Kollege [Erich Rothacker]
Bonn, 06.05.1929 [6/V [19]29]Brief an Kollege [Erich Rothacker]
Frankfurt am Main, 28.07.1922 [28.07. [19]22]Brief an Kollege [Erich Rothacker]
Frankfurt am Main, 03.01.1948 [3.I.1948]Brief an Kollege Rothacker
Frankfurt am Main, 17.11.1941 [17. Nov. 1941]Brief an Kollege Rothacker
Frankfurt am Main, 21.11.1941 [21. Nov. 1941]Brief an Kollege Rothacker
Frankfurt am Main, 13.01.1948 [13.I.1948]Brief an Prof. Dr. Erich Rothacker, Bonn
Berlin, 24.12.1930 [24. Dezember 1930]Brief an Prof. Dr. Erich Rothacker, Bonn am Rhein, Schumannstr. 41
Frankfurt am Main, 28.11.1941 [28. Nov. 1941]Brief an Prof. Dr. Erich Rothacker, Heidelberg, Häusserstr. 9
Frankfurt am Main, 28.01.1926 [28. Januar 1926]Brief an Prof. Rothacker
Heidelberg, 08.11.1929 [8 XI [19]29]Brief an Professor [Erich Rothacker]
Venedig, 02.04.1928 [2-4-[19]28]Brief an Professor [Erich Rothacker]
San Gimignano, 20.06.1925 [20.VI. [19]25]Brief an Professor [Erich Rothacker]
Bonn, 25.11.1928 [25.11. [19]28]Brief an Professor [Erich Rothacker]
Rödder, 03.01.1948 [3.I.47 [vielmehr: 03.01.1948]]