| Anthony Kaiser Papers | Abstracts |
| Robert Kanter Papers | Abstracts |
| Raymond Kay Papers | Abstracts |
| William and Ann Kemsley Papers | Abstracts |
| Kenneth Forbes Papers | Abstracts |
| Charles F. Kincaid Papers | Abstracts |
| Harvey Kitzman Papers | Abstracts |
| Lucien Koch Papers | Abstracts |
| E. H. Kohlhagen Papers | Abstracts |
| Alex Kovacs Papers | Abstracts |
| Joseph J. Kowalski Papers | Abstracts |
| Jay B. Krane Papers | Abstracts |
| Dorothy Kraus Papers | Abstracts |
| Samuel Krieger Papers | Abstracts |
| Frank LaBita Papers | Abstracts |
| Labor Committee for Safe Energy and Full Employment Records | Abstracts |
| Labor Notes Records | Abstracts |
| Lloyd Lampher Papers | Abstracts |
| Layle Lane Papers | Abstracts |
| Charles Lang Papers | Abstracts |
| Milton Lapine Papers | Abstracts |
| E.W. Latchem Papers | Abstracts |
| Ben Legere Papers | Abstracts |
| Richard T. Leonard Papers | Abstracts |
| Harry E. Lester Papers | Abstracts |
| Edward Levinson Papers | Abstracts |
| John L. Lewis Papers | Abstracts |
| James Lindahl Papers | Abstracts |
| C. Z. Lindsey Papers | Abstracts |
| Henry Richardson Linville Papers | Abstracts |
| Howard Lipton Papers | Abstracts |
| Ed Liska Papers | Abstracts |
| John W. Livingston Papers | Abstracts |
| Percy Llewellyn Papers | Abstracts |
| Frank Lohr Papers | Abstracts |
| Robert Lopez Papers | Abstracts |
| George Lutzai Papers | Abstracts |
| George Lyons Papers | Abstracts |
| Nora Maczko Papers | Abstracts |
| Michael Manning Papers | Abstracts |
| Blaine Marrin Papers | Abstracts |
| Ben Martin Papers | Abstracts |
| Gabriel R. Mason Papers | Abstracts |
| Fred Masters Papers | Abstracts |
| Joseph Mattson Papers | Abstracts |
| Emil Mazey Papers | Abstracts |
| Ernest Mazey Papers | Abstracts |
| Herbert T. McCreedy Papers | Abstracts |
| Thomas McNett Papers | Abstracts |
| Lewis H. Michener Papers | Abstracts |
