- 1966 to 1967 1
- 1968 to 1969 1
- 1970 to 1971 44
- 1972 to 1973 54
- 1974 to 1975 58
- 1976 to 1977 70
- 1978 to 1979 18
- 1980 to 1981 7
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