- 1950 to 19517,524
- 1952 to 19536,701
- 1954 to 19556,092
- 1956 to 19576,093
- 1958 to 19596,077
- 1960 to 19619,081
- 1962 to 196310,194
- 1964 to 196512,144
- 1966 to 196710,768
- 19688,494
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