[Correspondence] 1937 April 26-1938 December 3

[Correspondence] 1939 January 2-1939 December 16

[Correspondence] 1940 January 8-1941 November 2

[Correspondence] undated

[Rolf and Friedel's World War II/post-war personal documents and correspondence] 1944-1947

[Empty envelopes] undated