- 1914 to 19192
- 1920 to 1929515
- 1930 to 1939367
- 1940 to 1949197
- 1950 to 19598
- 1960 to 19698
- 1970 to 19798
- 1980 to 19898
- 1990 to 19928
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