- 1980 to 19813,308
- 1982 to 19833,199
- 1984 to 19854,396
- 1986 to 19874,481
- 1988 to 19892,268
- 1990 to 19911,700
- 1992 to 19931,657
- 1994 to 19951,973
- 1996 to 19972,479
- 19981,191
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