- 1950 to 19517,343
- 1952 to 19536,518
- 1954 to 19555,929
- 1956 to 19575,930
- 1958 to 19595,904
- 1960 to 19618,915
- 1962 to 196310,030
- 1964 to 196511,976
- 1966 to 196710,604
- 19688,330
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