Subject
- Paint industry and trade1
- Periodic table of the elements1
- Petroleum industry and trade1
- Philip Bridges Sadtler (1884-1964)1
- Phosgene1
- Physicists1
- Physiology1
- Plastics1
- Potash1
- Potash industry and trade1
- Queeny, John Francis, 1859-19331
- Radioimmunoassay1
- Rafferty, James A., 1886-19511
- Refrigeration and refrigerating machinery--Research1
- Remsen, Ira, 1846-19271
- Rubber1
- Saccharin1
- Sadtler, Samuel Philip, 1847-19231
- Sadtler, Samuel Schmucker, 1873-19541
- Sanitation1