- 1950 to 19517,549
- 1952 to 19536,724
- 1954 to 19556,112
- 1956 to 19576,099
- 1958 to 19596,076
- 1960 to 19619,087
- 1962 to 196310,198
- 1964 to 196512,148
- 1966 to 196710,777
- 19688,499
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