- 1918 to 1918 3,899
- 1919 to 1919 3,790
- 1920 to 1920 2,431
- 1921 to 1921 2,102
- 1922 to 1922 2,376
- 1923 to 1923 1,251
- 1924 to 1924 2,477
- 1925 to 1925 2,978
- 1926 to 1926 2,690
- 1927 to 1927 2,534
- 1928 to 1928 1,179
- 1929 to 1929 1,313
- 1930 to 1930 1,698
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