- 1936 to 1939677
- 1940 to 1944977
- 1945 to 19492,865
- 1950 to 19543,077
- 1955 to 19592,786
- 1960 to 19643,335
- 1965 to 19694,823
- 1970 to 19742,722
- 1975 to 19792,445
- 1980 to 19821,625
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