- California, First-Person Narratives ~ Books ~ 1849-1900
- Chautauqua Performers ~ Advertising Flyers ~ 1904-1940
- Chesapeake Bay and Washington, D.C. ~ Books ~ 1600-1925
- Chicago Daily News ~ Photographs ~ 1902-1933
- The Chinese in California ~ Multiformat ~ 1850-1925
- Civil War Era ~ Band Music ~ Multiformat
- Civil War Images ~ Multiformat ~ 1861-1865
- Civil War Maps ~ 1861-1865
- Civil War Maps ~ Hotchkiss Maps ~ 1861-1865
- Civil War Soldiers, Pennsylvania ~ Multiformat ~ 1861-1865
- Civil War Washington, D.C. ~ Horatio Nelson Taft ~ Diary ~ 1861-1865
- Civil War ~ Brady Studio and Others ~ Photographs ~ 1861-1865
- Coca-Cola Advertising ~ Films ~ 1951-1999
- Conservation Movement ~ Multiformat ~ 1850-1920
- Continental Congress and Constitutional Convention ~ Documents ~ 1774-1789
- Coolidge Era ~ Multiformat ~ 1924-1929
- Copland, Aaron ~ Multiformat ~ 1900-1990
- Curtis, Edward ~ North American Indian Photographs ~ Ca. 1900