- 1986 to 19874
- 1988 to 19894
- 1990 to 19911
- 1992 to 19930
- 1994 to 19950
- 1996 to 19972
- 1998 to 19998
- 2000 to 200113
- 20024
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