- 1945 to 19465,265
- 1947 to 19498,152
- 1950 to 19517,340
- 1952 to 19547,484
- 1955 to 19565,773
- 1957 to 19596,803
- 1960 to 19618,912
- 1962 to 196412,607
- 1965 to 196611,187
- 1967 to 196912,184
- 19707,073
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