- 1900 to 190918
- 1910 to 191919
- 1920 to 192919
- 1930 to 193918
- 1940 to 194935
- 1950 to 195925
- 1960 to 19690
- 1970 to 19790
- 1980 to 19890
- 1990 to 19942
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