- 1865 to 18692,783
- 1870 to 18742,853
- 1875 to 18792,671
- 1880 to 18842,701
- 1885 to 18893,387
- 1890 to 18944,295
- 1895 to 18994,371
- 1900 to 19044,474
- 1905 to 19094,186
- 1910 to 19144,819
- 1915 to 19198,741
- 19204,021
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