US Census, “Top Ten Countries with Which the United States Trades”, May 2012, http://www.census.gov/foreign-trade/top/dst/current /balance.html
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Galina Hale and Bart Hobijn, “The U. S. Content of ‘Made in China’”, Federal Reserve Bank of San Francisco Economic Letter, August 8, 2011, http://www.frbsf.org/publications/economics/letter/2011/el2011–25.html?utm_source=home
