- 19535,469
- 1954 to 19556,093
- 1956 to 19576,096
- 1958 to 19596,080
- 1960 to 19619,084
- 1962 to 196310,196
- 1964 to 196512,146
- 1966 to 196710,773
- 1968 to 196910,926
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