- 19112,642
- 1912 to 19143,470
- 1915 to 19163,106
- 1917 to 19197,248
- 1920 to 19213,820
- 1922 to 19245,578
- 1925 to 19264,052
- 1927 to 19294,299
- 1930 to 19313,249
- 1932 to 19343,580
- 19352,613
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