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https://en.wikipedia.org/wiki/History_of_the_United_States_Merchant_Marine
https://en.wikipedia.org/wiki/Maritime_history
http://www.maritimeheritage.org/ports/usMassachusetts.html
http://www.maritimeheritage.org/ports/usNewYork.html
http://teachingresources.atlas.illinois.edu/chinatrade/introduction04.html
https://en.wikipedia.org/wiki/Shipping_industry_of_China
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