Meat Inspection Act/Pure Food and Drug Act – Encyclopedia of U.S. History
William McKinley – Encyclopedia of U.S. History
Joseph McCarthy – Encyclopedia of U.S. History
John McCain – Encyclopedia of U.S. History
Mayflower – Encyclopedia of U.S. History
Louis B. Mayer – Encyclopedia of U.S. History
Cotton Mather – Encyclopedia of U.S. History
Massachusetts Bay Colony – Encyclopedia of U.S. History
Massachusetts – Encyclopedia of U.S. History
Maryland – Encyclopedia of U.S. History