| The Atomic Age |
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| The Digital Age |
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| The Electric Age |
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| The Industrial Revolution |
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| A Rebirth of Science |
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| Science of the Ancient World |
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| Science of the Middle Ages |
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| What Happened at Fort Sumter? |
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| What Happened at Lexington and Concord? |
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| What Happened at Pearl Harbor? |
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| What Happened During the Cuban Missile Crisis? |
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| What Happened on D-Day? |
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| Weapons and Machines of the Cold War |
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| Weapons and Machines of the Gulf War |
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| Weapons and Machines of the Vietnam War |
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| Weapons and Machines of World War I |
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| Weapons and Machines of World War II |
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| The American Revolution: Timelines, Facts, and Battles |
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| The Civil War: Timelines, Facts, and Battles |
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| The Vietnam War: Timelines, Facts, and Battles |
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| The War on Terror: Timelines, Facts, and Battles |
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| World War I: Timelines, Facts, and Battles |
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| World War II in Europe and North Africa: Timelines, Facts, and Battles |
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| World War II in the Pacific: Timelines, Facts, and Battles |
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