- 19595,137
- 1960 to 196413,888
- 1965 to 196915,855
- 1970 to 19749,898
- 1975 to 19799,591
- 1980 to 19846,806
- 1985 to 19898,670
- 1990 to 19945,128
- 1995 to 19996,007
- 2000 to 20042,138
- 2005 to 2009229
- 2010350
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