- 1970 to 19742
- 1975 to 19790
- 1980 to 19840
- 1985 to 19891
- 1990 to 199432
- 1995 to 19998
- 2000 to 20040
- 2005 to 20063
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