- 1963 to 196411,554
- 1965 to 196611,190
- 1967 to 196912,186
- 1970 to 19717,833
- 1972 to 19747,742
- 1975 to 19766,766
- 1977 to 19798,453
- 1980 to 19813,573
- 1982 to 19844,543
- 1985 to 19865,117
- 1987 to 19894,700
- 19901,283
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