- 19534,658
- 1954 to 19555,287
- 1956 to 19575,266
- 1958 to 19595,241
- 1960 to 19618,376
- 1962 to 19639,496
- 1964 to 196511,420
- 1966 to 196710,110
- 1968 to 196910,270
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