V. 1. Thematic articles -- v. 2. Washington-Tyler, 1789-1845 -- v. 3. Polk-Arthur, 1845-1885 -- v. 4. Cleveland-Coolidge, 1885-1929 -- v. 5. Hoover-Nixon, 1929-1974 -- v. 6. Ford-Obama, 1974-Present.
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