- 1945 to 19465,483
- 1947 to 19498,383
- 1950 to 19517,549
- 1952 to 19547,693
- 1955 to 19565,965
- 1957 to 19596,981
- 1960 to 19619,087
- 1962 to 196412,783
- 1965 to 196611,368
- 1967 to 196912,366
- 19707,098
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