Creator
- Osterweil, John W.1
- Parkhill, Charles B. (1859-1933)1
- Parkin, Thomas1
- Penn, William H.1
- Pepper, Claude D.1
- Peterson, Franklin M1
- Pfeiffer Family1
- Plant System 1
- Pleas, Charles Earl1
- Ponder, Clara M.1
- Ponder, Ernest Ayer, 1918-19981
- Price, Elsie Goldsby1
- Pyburn, Nita Katharine1
- Quinn, Charles1
- Rambod, Max1
- Rifkin, Jack, 1922-20021
- Rios, William1
- Roach, Ulysses B. (Ulysses Bracy)1
- Roberts, Theodore1
- Rohrer, Jessie C. (1891-1987)1