The History of Zero: Exploring Our Place-Value Number System (Powermath)
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How the Arabs Invented Algebra: The History of the Concept of Variables
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Tennessee: The Volunteer State
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Minnesota: Land of 10,000 Lakes
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Washington: The Evergreen State
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Delaware: The First State
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Indiana: The Hoosier State
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Michigan: The Great Lakes State
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Biggest Snowball
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Tracks in the Snow
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Huellas en la nieve
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Massachusetts: The Bay State
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Texas: The Lone Star State
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California: The Golden State
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Florida: The Sunshine State
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New York: The Empire State
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