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- Project Muse594
- ebrary, Inc400
- ProQuest (Firm)50
- Project Muse. distributor43
- Douglass, Frederick, 1818-189533
- Holzer, Harold24
- Finkelman, Paul, 1949-22
- Lincoln, Abraham, 1809-186519
- Project Muse, distributor18
- McKivigan, John R., 1949-17
- Smith, John David, 1949-17
- Hess, Earl J.16
- Gallagher, Gary W.15
- Harrold, Stanley15
- Pickenpaugh, Roger15
- Williams, Frank J.15
- Foner, Eric, 1943-14
- Marszalek, John F., 1939-14
- Symonds, Craig L.14
- Escott, Paul D., 1947-13