Publisher
- PRP Productions1
- Pan American Union1
- Perrion Records1
- Philadelphia Art Alliance1
- Pittsburgh Plate Glass Company1
- Plebs League1
- Pleyel, Ignaz1
- PolyGram Video1
- Prager, R. L.1
- Princeton University Press1
- Public Publishing Company, Inc.1
- Publishing House of the Young Communist International1
- Pulse Publishing1
- Radical Review Publishing Association1
- Ramp Buildings Corporation1
- Rand School of Social Science1
- Rap-A-Lot Records1
- Raymond Bonnefond (Firm)1
- Red Cedar Shingle Bureau1
- Red Cedar Shingle Manufacturers' Association1