- 1930 to 1939 8,294
- 1940 to 1949 12,815
- 1950 to 1959 10,018
- 1960 to 1969 13,538
- 1970 to 1979 7,683
- 1980 to 1989 9,993
- 1990 to 1999 6,487
- 2000 to 2009 2,002
- 2010 to 2013 358
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