- 1863 to 18642,231
- 1865 to 18692,624
- 1870 to 18741,937
- 1875 to 18791,781
- 1880 to 18841,790
- 1885 to 18892,463
- 1890 to 18943,232
- 1895 to 18993,278
- 1900 to 19043,301
- 19052,329
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