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travel × 93transportation × 12
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united-states × 7
middle-ages × 6
ancient-history × 6
trade × 5
europe × 4
ancient-rome × 4
social-history × 4
18th-century × 4
aircraft × 4
ships × 4
crime × 4
20th-century × 3
germany × 3
china × 3
technology × 3
ancient-china × 3
immigration × 3
victorian × 3
1960s × 3
migration × 3
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