- 1947 to 19493
- 1950 to 195412
- 1955 to 19595
- 1960 to 19644
- 1965 to 196913
- 1970 to 19742
- 1975 to 19790
- 1980 to 198412
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