- 1945 to 19465,416
- 1947 to 19498,303
- 1950 to 19517,488
- 1952 to 19547,631
- 1955 to 19565,921
- 1957 to 19596,952
- 1960 to 19619,060
- 1962 to 196412,755
- 1965 to 196611,339
- 1967 to 196912,337
- 19707,076
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