- 1973 to 19746,548
- 1975 to 19799,588
- 1980 to 19846,803
- 1985 to 19898,657
- 1990 to 19945,108
- 1995 to 19995,988
- 2000 to 20042,104
- 2005 to 2009191
- 2010346
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