- 1870 to 187939
- 1880 to 18891,363
- 1890 to 1899935
- 1900 to 1909349
- 1910 to 1919231
- 1920 to 192952
- 1930 to 193992
- 1940 to 19451
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