- 1908 to 1909 1,998
- 1910 to 1911 2,088
- 1912 to 1914 2,554
- 1915 to 1916 2,170
- 1917 to 1919 6,324
- 1920 to 1921 3,087
- 1922 to 1924 4,829
- 1925 to 1926 3,479
- 1927 to 1929 3,641
- 1930 to 1931 2,450
- 1932 to 1932 1,398
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