- 19112,248
- 1912 to 19143,052
- 1915 to 19162,670
- 1917 to 19196,827
- 1920 to 19213,369
- 1922 to 19245,131
- 1925 to 19263,538
- 1927 to 19293,783
- 1930 to 19312,630
- 1932 to 19342,910
- 19351,980
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