| Y 3.L 22 | Interagency Land Acquisition Conference (1971-?) |
| Y 3.L 44 | Commission to Revise and Codify the Laws of the United States (1899-1906) |
| Y 3.L 52 | Legal Services Corporation (1974- ) |
| Y 3.L 58 | Lewis and Clark Trail Commission (1964-1969) |
| Y 3.L 61 | National Commission on Libraries and Information Science (1970-2008) |
| Y 3.L 61/2 | Federal Interagency Field Librarians Workshop (1972-1974) |
| Y 3.L 63 | Lincoln Sesquicentennial Commission (1957-1960) |
| Y 3.L 71 | Literacy Information and Communication System (LINCS) (1991- ) |
| Y 3.L 95 | Lowell Historic Canal District Commission (1975-1977) |
