- 1590 to 159927
- 1600 to 164950
- 1650 to 169950
- 1700 to 1749117
- 1750 to 1799607
- 1800 to 18493,600
- 1850 to 189912,656
- 1900 to 194940,333
- 1950 to 199967,757
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