- 1980 to 19813
- 1982 to 19842
- 1985 to 19862
- 1987 to 19894
- 1990 to 19912
- 1992 to 19940
- 1995 to 199616
- 1997 to 199916
- 2000 to 20013
- 20021
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