- 1870 to 18711,337
- 1872 to 18731,385
- 1874 to 18751,447
- 1876 to 18771,312
- 1878 to 18791,272
- 1880 to 18811,301
- 1882 to 18831,347
- 1884 to 18851,242
- 1886 to 18871,293
- 1888 to 18892,096
- 18902,906
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