Names
- Olson, William C.1
- Optical Society of America1
- Optical Society of America.1
- Oregon State University1
- Otero, Jose M1
- Owens, James S.1
- Paganelli, E.1
- Page, Thornton1
- Parker, J. W.1
- Parsons, Carey Evlya1
- Parsons, W. S.1
- Paschen, F.1
- Pasvolsky, Leo1
- Peckham, Donald C.1
- Peet, Bert W.1
- Peet, Max M1
- Pendill, Claudius G.1
- Penney, William George, 1909-1
- Penney, William George, Sir, 1909-1
- Pergamon Institute1