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Labor Union: Definition, History, and Examples
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Labor Unions During the Great Depression and New Deal
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Home - Worker Organizing Resource and Knowledge Center
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Labor History Comes Alive Fall 2014
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Why do We Celebrate Labor Day? What does it Mean?
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Trade Unions - Characteristics, Role and Significance
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Who Rules America: The Rise and Fall of Labor Unions in the U.S.
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Trade union - Wikipedia
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Labor union - New World Encyclopedia
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The American Labor Force Chapter 12. Americans at Work Chapter 12