- 1846 to 18491,045
- 1850 to 18541,389
- 1855 to 18591,499
- 1860 to 18643,259
- 1865 to 18692,600
- 1870 to 18741,931
- 1875 to 18791,776
- 18801,203
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