1. Dewey correspondence. The Correspondence of John Dewey, 1871-1952: Electronic edition, available via Past Masters
2. Hocking papers. William Ernest Hocking Papers, Houghton Library Cambridge, MA Harvard University
3. May papers. Mark Arthur May Papers, Manuscripts and Archives. New Haven, CT Yale University
4. Shryock papers. Richard H. Shryock Papers Philadelphia, PA American Philosophical Society
5. Taylor papers. Henry C. Taylor Papers. Madison, WI Wisconsin Historical Society