Works
- Einsteinturm / Potsdam
- Letter from: 6.7.1918, Seclin
- Letter from: 8.7.1918, Pont du Hem
- Letter from: 19.7.1918, Charlottenburg (Berlin;Germany)
- Letter from: 4.8.1918, P.L.
- Letter from: 4.8.1918, Charlottenburg (Berlin;Germany)
- Letter from: 9.8.1918, A.
- Letter from: 20.8.1918, V.
- Letter from: 21.8.1918, V.
- Letter from: 12.5.1920, Charlottenburg
- Letter from: 13.5.1920, Charlottenburg
- Letter from: 31.5.1920, Charlottenburg
- Letter from: 2.6.1920, Charlottenburg
- Letter from: 5.6.1920, Charlottenburg
- Letter from: 13.6.1920, Charlottenburg
- Letter from: 15.6.1920, Charlottenburg
- Letter from: 16.6.1920, Allenstein (Germany)
- Letter from: 17.6.1920, Allenstein (Germany)
- Letter from: 17.6.1920, Charlottenburg
- Letter from: 18.6.1920, Allenstein (Germany)
- Letter from: 18.6.1920, Charlottenburg
- Letter from: 19.6.1920, Charlottenburg
- Letter from: 20.6.1920, Charlottenburg
- Letter from: 21.6.1920, Charlottenburg
- Letter from: 22.6.1920, Charlottenburg
- Letter from: 24.6.1920, Allenstein (Germany)
- Letter from: 24.6.1920, Charlottenburg
- Letter from: 26.6.1920, Charlottenburg
- Letter from: 28.6.1920, Charlottenburg
- Letter from: 30.6.1920, Rauschen (Germany)
- Letter from: 30.6.1920, Charlottenburg
- Letter from: 1.7.1920, Charlottenburg
- Letter from: 3.7.1920, Charlottenburg
- Letter from: 4.7.1920, Charlottenburg
- Letter from: 5.7.1920, Nidden
- Letter from: 7.8.1922, Schönwald im Schwarzwald (Germany)
- Letter from: 14.8.1922, Charlottenburg
- Letter from: 5.10.1924, Charlottenburg (Berlin;Germany)
- Letter from: 28.1.1925, Charlottenburg
- Letter from: 21.8.1925, Charlottenburg
- Letter from: 6.7.1948, San Francisco
- Emanu-El Synagoge / Grand Rapids
- Letter from: 8.7.1948, San Francisco
- Letter from: 17.11.1948, Detroit
- Letter from: 25.6.1949, Auf dem Flug von New York nach Cleveland
- Letter from: 30.6.1949, Chicago
- Letter from: 27.1.1950, Grand Rapids
- Letter from: 31.1.1950, Unterwegs zwischen Cleveland und New York
- Letter from: 31.1.1950, Unterwegs zwischen Cleveland und New York
- Letter from: 15.7.1950, San Francisco
- Letter from: 17.8.1950, Betw. Grand Rapids & Cleveland
- Letter from: 19.8.1950, Cleveland
- Letter from: 26.3.1951, St. Paul
- Letter from: 29.3.1951, Cleveland
- Letter from: 10.7.1951, Cleveland
- Letter from: 6.6.1952, San Francisco