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russia × 376soviet-union × 62
military × 31
19th-century × 23
world-war-two × 22
united-states × 21
world-war-one × 21
20th-century × 20
18th-century × 20
poland × 19
kamchatka × 19
russian-revolution × 18
ukraine × 16
japan × 15
colonization × 14
war × 12
naval × 12
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age-of-sail × 12
middle-ages × 11
communism × 11
california × 11
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travel × 9