- 19766,009
- 1977 to 19798,337
- 1980 to 19813,545
- 1982 to 19844,514
- 1985 to 19865,097
- 1987 to 19894,654
- 1990 to 19911,946
- 1992 to 19943,754
- 1995 to 19963,456
- 1997 to 19993,009
- 2000 to 20011,576
- 2002455
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