- 1940 to 19442
- 1945 to 19493
- 1950 to 19541
- 1955 to 19591
- 1960 to 19640
- 1965 to 19690
- 1970 to 19740
- 1975 to 19790
- 1980 to 19840
- 1985 to 19890
- 1990 to 19942
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