- 1956 to 19591
- 1960 to 19640
- 1965 to 19690
- 1970 to 19742
- 1975 to 197911
- 1980 to 198419
- 1985 to 198919
- 1990 to 199418
- 1995 to 199910
- 2000 to 20025
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