| Polly Howe Papers | Abstracts |
| International Brotherhood of Electrical Workers (IBEW) Local 58 Records | Abstracts |
| International Printing Pressmen Local 2 Records | Abstracts |
| International Socialists Records | Abstracts |
| Iron Molders Union, New York Records | Abstracts |
| Industrial Workers of the World Records | Abstracts |
| James Moore Audio Recordings | Abstracts |
| Richard Jensen Papers | Abstracts |
| Jewish Labor Committee Records | Abstracts |
| Edgar G. Johnston Papers | Abstracts |
| Joint Committee on Library Service to Labor Groups Records | Abstracts |
| John Jurkanin Papers | Abstracts |
| Jack Kadish Papers | Abstracts |
| Stanley D. Kane Papers | Abstracts |
| Lyman D. Ketchum Papers | Abstracts |
| Wanda Killian Papers | Abstracts |
| L. Bruce Kingery Papers | Abstracts |
| David Y. Klein Papers | Abstracts |
| Raymond Koch and Charlotte Moskowitz Papers | Abstracts |
| Henry Kraus Papers | Abstracts |
| Labor and Working Class History Association Records | Abstracts |
| Labor Notes Records | Abstracts |
| Labor Today Records | Abstracts |
| Labor's Non-Partisan League Records | Abstracts |
| James Lafferty Papers | Abstracts |
| John C. Leggett Papers | Abstracts |
| Herbert Lindberg Papers | Abstracts |
| C. Z. Lindsey Papers | Abstracts |
| Mrs. Stanley Lowe Papers | Abstracts |
| Jakub L. Lublinski Papers | Abstracts |
| Hugh Macmillan Papers | Abstracts |
| Mark Adams Radio Program Records | Abstracts |
| Mark Heinen Papers | Abstracts |
| Frank Marquart Papers | Abstracts |
| Patrick Vincent McNamara Papers | Abstracts |
| Michigan Commission On Displaced Persons Records | Abstracts |
| Michigan Federation of Typographical Auxiliaries Records | Abstracts |
| Michigan Labor History Society Records | Abstracts |
| Annetta Miller Papers | Abstracts |
| T. Denton Miller Papers | Abstracts |
| Miners For Democracy Records | Abstracts |
| David Moberg Papers | Abstracts |
| Tom Mooney Papers | Abstracts |
| Loretta Moore Papers | Abstracts |
| Elizabeth Morgan Papers | Abstracts |
| James B. Morrissey Papers | Abstracts |
| Vincent J. Murray Papers | Abstracts |
| Tom Myerscough Papers | Abstracts |
| NALC Department of Research and Education Records | Abstracts |
| NALC Executive Assistant to the President: F. John Miller Records | Abstracts |
