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  1. Added Nov 27, 2006 by ms.chang
    Resource for data about the people and economy of the United States.
  2. Added Nov 27, 2006 by meimei5252 and 1 other
    Use balance beams to represent simple linear equations. Coefficients and constants may be positive or negative.
  3. Added Nov 27, 2006 by ms.chang and 1 other
    Teach math and social justice simultaneously!
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