- 1858 to 18591,198
- 1860 to 18643,303
- 1865 to 18692,626
- 1870 to 18741,939
- 1875 to 18791,782
- 1880 to 18841,791
- 1885 to 18892,463
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