- 1862 to 18632,285
- 1864 to 18652,327
- 1866 to 18672,050
- 1868 to 18691,875
- 1870 to 18712,230
- 1872 to 18732,261
- 1874 to 18752,319
- 1876 to 18772,183
- 1878 to 18792,145
- 1880 to 18812,184
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