Entities
- Ojai Village Inn <Ojai, Kalifornien>
- Letter from: 7.7.1950, Ojai (Calif.)
- Letter from: 11.7.1950, Ojai (Calif.)
- Letter from: 16.7.1950, Ojai (Calif.)
- Open Air Theatre <London>
- Letter from: o.D. [Anfang August 1937], London (England)
- Letter from: 25.8.1937, London (England)
- Oper <München>
- Letter from: 6.9.1914, München
- Ostasiatische Gesellschaft <Berlin>
- Letter from: 12.5.1926, Berlin (Germany)
- Otto Wolff - Heck Geschäft <Berlin>
- Letter from: 10.11.1931, Berlin-Spandau