| The Basics of Animal Systems |
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| The Basics of Microbes |
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| Adolf Hitler and Winston Churchill: Rivals of World War II |
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| Al Capone and Eliot Ness: Rivals During Prohibition |
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| Alexander Hamilton and Aaron Burr: Rivals of the American Revolution |
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| The Founding Fathers and King George III: Rivals of Colonial America |
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| Thomas Jefferson and John Adams: Rivals in the New Nation |
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| Ulysses S. Grant and Robert E. Lee: Rivals of the Civil War |
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| The Story of Billy the Kid |
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