- 1860 to 18612,295
- 1862 to 18632,159
- 1864 to 18652,190
- 1866 to 18671,912
- 1868 to 18691,739
- 1870 to 18711,331
- 1872 to 18731,377
- 18741,194
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