Collection
- Nikolai P. Voronkov Manuscripts, 19661
- Nikolai Sergeevich Arsen'ev Papers, 1950-19651
- Nikolaĭ Aleksandrovich Gorchakov Papers, 1948-19851
- Nikolaĭ Ivanovich Vorobév Papers, 1920-19501
- Office of Public Affairs records, 1930s-1990s1
- Otis Fellows papers, 1926-19891
- Otto Rank Association records, 1934-19931
- Otto Rank papers, 1903-1988, bulk 1903-19401
- Paul Felix Lazarsfeld papers, 1930-19761
- Paul Gallico papers, 1922-19691
- Paul Oskar Kristeller papers, 1910-19891
- Pavel Alekseevich Sokolov Manuscripts, 1929-19661
- Pavel Sergeevich Krasnikov Papers, 1908-19291
- Pearl S. Buck Collection, 1932-19561
- Petr Moiseevich and Elena Sergeevna Pil'skii Manuscripts, 1920-19601
- Quentin Anderson papers, 1935-2003, bulk 1960-20001
- Rafael Steinberg Papers, 1903-2014, bulk 1944-19801
- Records of the Inter-University Committee on Travel Grants, 1958-19661
- Research Program on the History of the CPSU Manuscripts, 1955-19571
- Research Program on the USSR Manuscripts, 1950-19551