- 1950 to 19517,340
- 1952 to 19536,514
- 1954 to 19555,926
- 1956 to 19575,927
- 1958 to 19595,896
- 1960 to 19618,912
- 1962 to 196310,027
- 1964 to 196511,969
- 1966 to 196710,593
- 19688,320
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