- 1862 to 18642,438
- 1865 to 18662,164
- 1867 to 18691,937
- 1870 to 18711,321
- 1872 to 18741,607
- 1875 to 18761,375
- 1877 to 18791,331
- 1880 to 18811,284
- 1882 to 18841,414
- 1885 to 18861,258
- 1887 to 18892,229
- 18902,878
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