- 1872 to 18742,501
- 1875 to 18792,671
- 1880 to 18842,701
- 1885 to 18893,387
- 1890 to 18944,295
- 1895 to 18994,371
- 1900 to 19034,339
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