- 1950 to 19517,332
- 1952 to 19536,507
- 1954 to 19555,919
- 1956 to 19575,917
- 1958 to 19595,885
- 1960 to 19618,899
- 1962 to 196310,014
- 1964 to 196511,950
- 1966 to 196710,568
- 19688,300
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