- 19392,551
- 1940 to 19413,531
- 1942 to 19443,811
- 1945 to 19464,456
- 1947 to 19497,391
- 1950 to 19516,692
- 1952 to 19546,840
- 1955 to 19565,115
- 1957 to 19596,126
- 1960 to 19618,377
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