- 1935 to 1939333
- 1940 to 1949827
- 1950 to 19591,133
- 1960 to 19692,331
- 1970 to 19791,427
- 1980 to 19891,606
- 1990 to 1999939
- 2000 to 2009173
- 2010 to 20132
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