- 1977 to 19798,336
- 1980 to 19813,543
- 1982 to 19844,513
- 1985 to 19865,094
- 1987 to 19894,653
- 1990 to 19911,946
- 1992 to 19943,754
- 1995 to 19963,456
- 1997 to 19993,009
- 2000 to 20011,576
- 2002 to 2003568
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