- 19112,641
- 1912 to 19143,469
- 1915 to 19163,105
- 1917 to 19197,248
- 1920 to 19213,818
- 1922 to 19245,575
- 1925 to 19264,014
- 1927 to 19294,254
- 1930 to 19313,214
- 1932 to 19343,509
- 19352,572
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