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travel × 101transportation × 13
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united-states × 7
middle-ages × 6
ancient-history × 6
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germany × 5
trade × 5
ancient-rome × 4
social-history × 4
aircraft × 4
ships × 4
crime × 4
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religion × 3
china × 3
technology × 3
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immigration × 3
victorian × 3
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