- 1940 to 194410
- 1945 to 194959
- 1950 to 195422
- 1955 to 19592
- 1960 to 196419
- 1965 to 196915
- 1970 to 19741
- 1975 to 19791
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