- 1850 to 18591
- 1860 to 18791
- 1880 to 189982
- 1900 to 1919114
- 1920 to 1939158
- 1940 to 1959172
- 1960 to 197988
- 1980 to 1999264
- 2000 to 200924
The preservation of the Duke University Libraries Digital Collections and the Duke Digital Repository programs are supported in part by the Lowell and Eileen Aptman Digital Preservation Fund