- 1980 to 19813,541
- 1982 to 19833,464
- 1984 to 19854,620
- 1986 to 19874,708
- 1988 to 19892,510
- 1990 to 19911,935
- 1992 to 19932,221
- 1994 to 19953,613
- 1996 to 19972,637
- 19981,230
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