- 1980 to 19813
- 1982 to 19840
- 1985 to 19861
- 1987 to 198912
- 1990 to 19910
- 1992 to 19940
- 1995 to 19964
- 1997 to 19992
- 2000 to 20015
- 20022
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