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History
Aeronautics, Military
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African American women
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Antislavery movements
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Atomic bomb
1
Calculators
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Computer engineers
1
Espionage, Soviet
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Fighter pilots
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Fighter plane combat
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Heads of State
1
Intelligence officers
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Intelligence service
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Legislators
1
Mathematicians
1
Officers
1
Physicists
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Physics
1
Slaves
1
Soldiers
1
Spies
1
Underground railroad
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