- 1950 to 1954 36
- 1955 to 1959 457
- 1960 to 1964 357
- 1965 to 1969 1,332
- 1970 to 1974 1,034
- 1975 to 1979 533
- 1980 to 1984 515
- 1985 to 1989 6
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