- 1910 to 1914477
- 1915 to 191966
- 1920 to 1924347
- 1925 to 1929221
- 1930 to 1934630
- 1935 to 19391,185
- 1940 to 1944759
- 1945 to 1949423
- 1950 to 195117
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