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aircraft × 95world-war-two × 43
military × 23
20th-century × 15
united-states × 13
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transportation × 8
nazi-germany × 6
war × 6
world-war-one × 6
naval × 6
japan × 5
warfare × 5
weapons × 5
cold-war × 5
germany × 4
technology × 4
travel × 4
19th-century × 3
crime × 3
1960s × 3
1970s × 3
soviet-union × 2
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