- 1950 to 19517,331
- 1952 to 19536,506
- 1954 to 19555,917
- 1956 to 19575,914
- 1958 to 19595,884
- 1960 to 19618,898
- 1962 to 196310,012
- 1964 to 196511,948
- 1966 to 196710,565
- 19688,299
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