- 1903 to 19042,244
- 1905 to 19093,016
- 1910 to 19143,586
- 1915 to 19197,492
- 1920 to 19246,666
- 1925 to 19295,164
- 1930 to 19333,437
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