Subject
- Ollendorff, H. G. (Heinrich Gottfried), 1803-18651
- Oppenheimer, J. Robert, 1904-19671
- Ostwald, Wilhelm, 1853-19321
- Ostwald, Wolfgang, 1883-19432
- Picture puzzles1
- Portraits4
- Portugal--Lisbon1
- Prescriptions, formulae, receipts, etc.1
- Propaganda1
- Propaganda, Anti-German1
- Refugees3
- Reston, James, 1909-19951
- S. W. Theise, Inc.1
- Sailing1
- Sailing ships1
- Scatchard, George, 1892-19731
- Schnell, Alfred, 1900-19443
- Schnell, Annemarie5
- Schnell, Eva, 1913-19442
- Schnell, Federico5