- 1950 to 19517,516
- 1952 to 19536,692
- 1954 to 19556,085
- 1956 to 19576,086
- 1958 to 19596,063
- 1960 to 19619,072
- 1962 to 196310,185
- 1964 to 196512,136
- 1966 to 196710,763
- 19688,489
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