- 1851 to 1851 947
- 1852 to 1854 1,115
- 1855 to 1856 1,027
- 1857 to 1859 1,255
- 1860 to 1861 2,184
- 1862 to 1864 2,267
- 1865 to 1866 2,074
- 1867 to 1869 1,902
- 1870 to 1871 1,295
- 1872 to 1874 1,583
- 1875 to 1875 1,163
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