- 1853 to 18541,085
- 1855 to 18591,496
- 1860 to 18643,255
- 1865 to 18692,596
- 1870 to 18741,927
- 1875 to 18791,772
- 1880 to 18841,777
- 1885 to 18892,450
- 1890 to 18943,205
- 18952,395
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