- 1876 to 18791,527
- 1880 to 18841,777
- 1885 to 18892,450
- 1890 to 18943,205
- 1895 to 18992,819
- 1900 to 19043,152
- 19052,139
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