- 1986 to 19874,481
- 1988 to 19892,268
- 1990 to 19911,700
- 1992 to 19931,657
- 1994 to 19951,973
- 1996 to 19972,479
- 1998 to 19991,960
- 2000 to 20011,560
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