- 1968 to 19696
- 1970 to 19710
- 1972 to 19730
- 1974 to 19750
- 1976 to 19770
- 1978 to 19790
- 1980 to 19810
- 1982 to 19830
- 1984 to 198514
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