- 1876 to 18791,507
- 1880 to 18841,759
- 1885 to 18892,432
- 1890 to 18943,190
- 1895 to 18992,805
- 1900 to 19043,138
- 19052,130
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