- 1850 to 185988
- 1860 to 1879189
- 1880 to 1899101
- 1900 to 1919141
- 1920 to 19395
- 1940 to 19594
- 1960 to 19794
- 1980 to 19994
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