- 1930 to 1934556
- 1935 to 1939763
- 1940 to 1944973
- 1945 to 19492,853
- 1950 to 19543,059
- 1955 to 19592,772
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