- 1986 to 198720
- 1988 to 19895
- 1990 to 199110
- 1992 to 19930
- 1994 to 19957
- 1996 to 199715
- 1998 to 199916
- 2000 to 200137
- 20026
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