- 1967 to 1967 8,282
- 1968 to 1969 10,263
- 1970 to 1971 7,376
- 1972 to 1973 6,573
- 1974 to 1975 6,292
- 1976 to 1977 6,302
- 1978 to 1979 7,341
- 1980 to 1981 3,308
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