- 1848 to 1849 856
- 1850 to 1851 974
- 1852 to 1854 1,066
- 1855 to 1856 975
- 1857 to 1859 1,200
- 1860 to 1861 2,118
- 1862 to 1864 2,177
- 1865 to 1866 1,997
- 1867 to 1869 1,842
- 1870 to 1870 968
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