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1960s × 45united-states × 20
political-history × 7
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1970s × 6
india × 3
aircraft × 3
travel × 3
crime × 3
1950s × 3
soviet-union × 2
economy × 2
identification × 2
france × 2
united-kingdom × 2
law × 2
canada × 2
racism × 2
vietnam-war × 2
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military × 1
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war × 1
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