- 1908 to 19093,595
- 1910 to 19113,790
- 1912 to 19144,252
- 1915 to 19163,887
- 1917 to 19198,032
- 1920 to 19214,605
- 1922 to 19245,590
- 1925 to 19264,066
- 1927 to 19294,314
- 1930 to 19313,401
- 1932 to 19332,746
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