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United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services, May 2011, BEA 11-35, CB 11-125, FT-900 (11-05)," Bureau of Economic Analysis (BEA) News Releases (July 12, 2011). https://fraser.stlouisfed.org/title/6148/item/604096, accessed on May 21, 2024.