- 1863 to 18642,238
- 1865 to 18692,638
- 1870 to 18741,948
- 1875 to 18791,789
- 1880 to 18841,798
- 1885 to 18892,469
- 1890 to 18943,239
- 1895 to 18993,323
- 1900 to 19043,482
- 19052,334
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