- 1876 to 18791,536
- 1880 to 18841,791
- 1885 to 18892,463
- 1890 to 18943,232
- 1895 to 18993,278
- 1900 to 19043,304
- 19052,330
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