- 1876 to 18792,422
- 1880 to 18842,701
- 1885 to 18893,387
- 1890 to 18944,295
- 1895 to 18994,371
- 1900 to 19044,474
- 19053,287
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