- 1872 to 18742,501
- 1875 to 18762,263
- 1877 to 18792,218
- 1880 to 18812,184
- 1882 to 18842,317
- 1885 to 18862,173
- 1887 to 18893,147
- 1890 to 18914,024
- 1892 to 18943,616
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