- Landscape and Architectural Design ~ Multiformat ~ 1850-1920
- Liberia ~ Maps ~ 1830-1870
- Library of Congress ~ 1939-1953
- Life Histories, Federal Writers' Project ~ Manuscripts ~ 1936-1940
- Lincoln, Abraham ~ Multiformat ~ 1850-1909
- Lincoln, Abraham ~ Papers ~ ca. 1850-1865
- Lincoln, Abraham, and Civil War ~ Sheet Music ~ Alfred Whital Stern ~ 1859-1909
- Louisiana Purchase ~ Maps ~ 1572-1902