- 1930 to 19313,251
- 1932 to 19332,595
- 1934 to 19353,212
- 1936 to 19374,453
- 1938 to 19394,264
- 1940 to 19414,579
- 1942 to 19433,787
- 1944 to 19454,562
- 1946 to 19476,024
- 1948 to 19496,298
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