- 1956 to 19592
- 1960 to 19641
- 1965 to 19691
- 1970 to 19741
- 1975 to 19799
- 1980 to 198412
- 1985 to 198913
- 1990 to 19949
- 1995 to 199911
- 2000 to 20012
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