- 1872 to 18741,611
- 1875 to 18791,782
- 1880 to 18841,791
- 1885 to 18892,463
- 1890 to 18943,232
- 1895 to 18993,278
- 1900 to 19033,174
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