- 1882 to 18841,420
- 1885 to 18892,463
- 1890 to 18943,232
- 1895 to 18992,910
- 1900 to 19043,285
- 1905 to 19093,157
- 1910 to 19143,838
- 1915 to 19197,776
- 19203,063
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