- 1823 to 1829 406
- 1830 to 1839 969
- 1840 to 1849 1,891
- 1850 to 1859 1,902
- 1860 to 1869 3,921
- 1870 to 1879 2,662
- 1880 to 1889 3,341
- 1890 to 1899 3,194
- 1900 to 1909 3,566
- 1910 to 1919 8,491
- 1920 to 1929 9,303
- 1930 to 1939 8,755
- 1940 to 1949 13,527
- 1950 to 1954 9,633
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