- 1863 to 18642,243
- 1865 to 18692,643
- 1870 to 18741,952
- 1875 to 18791,794
- 1880 to 18841,802
- 1885 to 18892,477
- 1890 to 18943,245
- 1895 to 18993,327
- 1900 to 19043,484
- 19052,336
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