- 1960 to 19619,084
- 1962 to 196310,196
- 1964 to 196512,146
- 1966 to 196710,773
- 1968 to 196910,926
- 1970 to 19717,856
- 1972 to 19737,073
- 1974 to 19756,832
- 1976 to 19776,772
- 1978 to 19797,814
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