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- ebrary, Inc180
- Project Muse176
- Project Muse. distributor51
- ProQuest (Firm)28
- American Council of Learned Societies27
- Beard, Charles A. (Charles Austin), 1874-194827
- Beard, Mary Ritter, 1876-195822
- Boorstin, Daniel J. (Daniel Joseph), 1914-200422
- Whitman, Walt, 1819-189220
- Bradford H. Gray Collection in the History of Social Thought (Beinecke Rare Book and Manuscript Library)19
- Santayana, George, 1863-195219
- Commager, Henry Steele, 1902-199817
- SpringerLink (Online service)17
- Mumford, Lewis, 1895-199016
- Oxford University Press16
- Frank, Waldo David, 1889-196715
- Kammen, Michael G.15
- American Antiquarian Society14
- Beer, Thomas, 1889-194014
- Columbia University. Oral History Research Office14