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russia × 368soviet-union × 61
military × 30
world-war-two × 22
19th-century × 22
united-states × 21
world-war-one × 21
20th-century × 20
18th-century × 20
poland × 19
kamchatka × 19
russian-revolution × 18
japan × 15
colonization × 14
war × 12
naval × 12
colonial-america × 12
age-of-sail × 12
ukraine × 12
communism × 11
california × 11
europe × 10
middle-ages × 9
religion × 9
travel × 9