- 1980 to 19813,583
- 1982 to 19833,502
- 1984 to 19854,656
- 1986 to 19874,751
- 1988 to 19892,558
- 1990 to 19911,982
- 1992 to 19932,269
- 1994 to 19953,668
- 1996 to 19972,733
- 19981,332
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