- 1905 to 190923
- 1910 to 191419
- 1915 to 191918
- 1920 to 192418
- 1925 to 192918
- 1930 to 193418
- 1935 to 193918
- 194019
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