- 1934 to 1934 1,576
- 1935 to 1939 5,816
- 1940 to 1944 5,462
- 1945 to 1949 10,127
- 1950 to 1954 10,151
- 1955 to 1959 7,517
- 1960 to 1964 13,390
- 1965 to 1969 15,424
- 1970 to 1974 9,526
- 1975 to 1979 9,238
- 1980 to 1984 6,508
- 1985 to 1989 8,389
- 1990 to 1994 3,664
- 1995 to 1999 5,083
- 2000 to 2003 2,050
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