- 19142,682
- 1915 to 19197,787
- 1920 to 19246,964
- 1925 to 19295,523
- 1930 to 19344,855
- 1935 to 19396,980
- 1940 to 19446,743
- 19453,390
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