- 19142,434
- 1915 to 19197,496
- 1920 to 19246,668
- 1925 to 19295,166
- 1930 to 19344,395
- 1935 to 19396,413
- 1940 to 19445,957
- 19452,669
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