- 19745,651
- 1975 to 19766,334
- 1977 to 19798,014
- 1980 to 19813,339
- 1982 to 19844,299
- 1985 to 19864,877
- 1987 to 19894,422
- 1990 to 19911,714
- 1992 to 19942,367
- 1995 to 19962,625
- 19971,272
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