- 19393,208
- 1940 to 19414,440
- 1942 to 19444,723
- 1945 to 19465,416
- 1947 to 19498,303
- 1950 to 19517,487
- 1952 to 19547,631
- 1955 to 19565,921
- 1957 to 19596,952
- 1960 to 19619,060
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