- 1986 to 19876
- 1988 to 19891
- 1990 to 19912
- 1992 to 19930
- 1994 to 19950
- 1996 to 199715
- 1998 to 19990
- 2000 to 20011
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