- 1973 to 19746,212
- 1975 to 19799,240
- 1980 to 19846,509
- 1985 to 19898,390
- 1990 to 19943,665
- 1995 to 19995,084
- 2000 to 20042,086
- 2005 to 2009187
- 2010344
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