- 1861 to 18642,894
- 1865 to 18692,633
- 1870 to 18741,942
- 1875 to 18791,784
- 1880 to 18841,794
- 1885 to 18892,466
- 1890 to 18943,235
- 18952,420
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