Creator
- Penton, Frank1
- Pepper, Claude D.1
- Pereira, Antonio, -19881
- Peterson, Franklin M1
- Pfeiffer Family1
- Plant System 1
- Pleas, Charles Earl1
- Polasek, Albin, 1879-19651
- Ponder, Clara M.1
- Ponder, Ernest Ayer, 1918-19981
- Postle, Joy1
- Price, Elsie Goldsby1
- Pullman Company1
- Pyburn, Nita Katharine1
- Quinn, Patrick 1
- Rackleff, Melvin1
- Randell, Gladys1
- Reiner, Jan1
- Resler, Walter H.1
- Rifkin, Jack, 1922-20021