- 1860 to 1861 2,178
- 1862 to 1863 2,004
- 1864 to 1865 2,010
- 1866 to 1867 1,847
- 1868 to 1869 1,681
- 1870 to 1871 1,288
- 1872 to 1873 1,340
- 1874 to 1875 1,403
- 1876 to 1877 1,260
- 1878 to 1879 1,228
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