- 1845 to 18491,137
- 1850 to 18541,386
- 1855 to 18591,495
- 1860 to 18643,251
- 1865 to 18692,593
- 1870 to 18741,927
- 1875 to 18791,772
- 1880 to 18841,777
- 18851,135
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