- 1845 to 18491,151
- 1850 to 18541,408
- 1855 to 18591,518
- 1860 to 18643,314
- 1865 to 18692,641
- 1870 to 18741,950
- 1875 to 18791,792
- 1880 to 18841,800
- 18851,153
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