- 1861 to 18642,912
- 1865 to 18692,650
- 1870 to 18741,962
- 1875 to 18791,801
- 1880 to 18841,808
- 1885 to 18892,485
- 1890 to 18943,401
- 18952,583
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