- 1986 to 198712
- 1988 to 19894
- 1990 to 19915
- 1992 to 19930
- 1994 to 19951
- 1996 to 199717
- 1998 to 199910
- 2000 to 200130
- 2002 to 200330
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