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結果 : did railroads create time zones
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How did trains standardize time in the United States? - William Heuisler

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How Did Railroads Contribute To The Development Of Universal Time? - Science Through Time

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Around Kansas - How Railroads Helped Create Time Zones - March 23, 2016

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History Snapshot: Time Zones were created in the US, 1883

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Railroads create the first time zones November 18 1883

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Day 33 of Outlier Stories: How Railroad Companies Created Time Zones

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