- 1957 to 19592
- 1960 to 19641
- 1965 to 19698
- 1970 to 197472
- 1975 to 1979223
- 1980 to 1984167
- 1985 to 19891,019
- 1990 to 1994356
- 1995 to 19992,176
- 2000 to 20031,432
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