| Francis O'Rourke Diary | Abstracts |
| William Ogden Papers | Abstracts |
| John Oneka Papers | Abstracts |
| Orange County Interfaith Committee to Aid the Farm Workers Records | Abstracts |
| Owosso Education Association Records | Abstracts |
| Joseph F. Pagano Papers | Abstracts |
| Francis Palmer Papers | Abstracts |
| John Panzner Papers | Abstracts |
| Dolores Paskal Papers | Abstracts |
| Oscar Paskal Collection | Abstracts |
| Peabody Report | Abstracts |
| Raymond Peck Papers | Abstracts |
| Jana Pellusch Papers | Abstracts |
| Carl Person Papers | Abstracts |
| Joseph Piconke Papers | Abstracts |
| Pinkerton's National Detective Agency Reports | Abstracts |
| James Poland Papers | Abstracts |
| Helen and Mardy Polaner Papers | Abstracts |
| Ethel Polk Papers | Abstracts |
| Philip D. Porter Papers | Abstracts |
| Will Poyfair Papers | Abstracts |
| Otto Pragan Papers | Abstracts |
| Jacob Probe Papers | Abstracts |
| PROD, Inc. Records | Abstracts |
| Edward Purdy Papers | Abstracts |
| Quarry Workers International Union of North America Records | Abstracts |
| Leo Ranco Papers | Abstracts |
| Richard Reist Papers | Abstracts |
| Roy Reuther Papers | Abstracts |
| Victor G. Reuther Papers | Abstracts |
| Victor Reuther Papers | Abstracts |
| Victor Reuther: UAW New Directions Movement Papers | Abstracts |
| Irving Richter Papers | Abstracts |
| Morris Riger Papers | Abstracts |
| Matilda Robbins Papers | Abstracts |
| George Roberts Papers | Abstracts |
| Archie W. Robinson Papers | Abstracts |
| Robert N. Rockwell Papers | Abstracts |
| Cecil Roeder Papers | Abstracts |
| Marvin Rogoff Papers | Abstracts |
| Harry Ross Papers | Abstracts |
| Fred Ross Sr. Papers | Abstracts |
| Robert Rossi Papers | Abstracts |
| Herrick S. Roth Papers | Abstracts |
| Jack Rugh Papers | Abstracts |
| Edward Sadlowski Papers | Abstracts |
| Saginaw Federation of Labor Records | Abstracts |
| Wilbert Salmi Papers | Abstracts |
| Clarence N. Sayen Papers | Abstracts |
| David S. Schick Papers | Abstracts |
