- 1990 to 19918
- 1992 to 199411
- 1995 to 19967
- 1997 to 199910
- 2000 to 20016
- 2002 to 200427
- 2005 to 200613
- 2007 to 200925
- 2010 to 20116
- 20121
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