Entities
- Ecu de France / London
- Letter from: 12.5.1938, Jerusalem
- Eibsee Hotel <Eibsee, Garmisch>
- Letter from: 24.1.1913, München
- Einstein-Spende
- Letter from: 21.6.1920, Charlottenburg
- El Escorial <Madrid>
- Letter from: 21.11.1929, Bilbao (Spain)
- Ermshaus <Berlin>
- Letter from: 20.9.1915, Charlottenburg
- Ernst Rowohlt Verlag <Leipzig>
- Letter from: 13.3.1914, Berlin (Germany)
- Ernst Wasmuth <Berlin> [Buchhandlung, Galerie und Verlag]
- Letter from: 26.8.1917, Ilipan
- Letter from: 5.11.1917, Charlottenburg (Berlin;Germany)
- Letter from: 18.6.1918, Charlottenburg (Berlin;Germany)
- Letter from: 21.6.1918, Charlottenburg (Berlin;Germany)
- Letter from: 6.7.1918, Charlottenburg (Berlin;Germany)
- Letter from: 9.2.1925, Fürstenberg (Germany)
- Letter from: 13.2.1925, Fürstenberg (Germany)
- Europäischer Hof <Heidelberg>
- Letter from: 27.6.1911, Bad Kissingen (Germany)
- European Mediterranean Academy [Academie Européenne méditerrannée]
- Letter from: 16.12.1928, St. Moritz
- Excelsior Savoia Palace Hotel <Trieste>
- Letter from: 13.4.1938, Trieste