- 1860 to 18612,293
- 1862 to 18632,157
- 1864 to 18652,187
- 1866 to 18671,909
- 1868 to 18691,736
- 1870 to 18711,329
- 1872 to 18731,374
- 1874 to 18751,437
- 18761,134
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