- 1800 to 1809 487
- 1810 to 1819 556
- 1820 to 1829 552
- 1830 to 1839 1,010
- 1840 to 1849 1,948
- 1850 to 1859 1,966
- 1860 to 1869 4,026
- 1870 to 1879 2,721
- 1880 to 1889 3,400
- 1890 to 1899 3,691
- 1900 to 1909 4,160
- 1910 to 1919 8,999
- 1920 to 1929 9,610
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