- Piddington, William Ernest Reginald1
- Pool, Ithiel de Sola1
- Postgate, Raymond1
- Prokovʹev, Vasiliĭ Ivanovich. [from old catalog]1
- Reinhardt, George C.1
- Reischauer, Edwin O.1
- Ripley, Josephine1
- Rákosi, Mátyás1
- Salisbury, Harrison E.1
- Sallai, Elemér1
- Sarkisyanz, Emanuel1
- Soloviev, Mikhail1
- Spiethoff, Bodo K.1
- Spiro, Edward1
- Standley, William Harrison1
- Stankiewicz, W. J.1
- Stec, George1
- Tarkhov, V. A.1
- Tetiukova, Pavla1
- Thompson, Virginia1