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United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services, September 2011, BEA 11-54, CB 11-188, FT-900 (11-09)," Bureau of Economic Analysis (BEA) News Releases (November 10, 2011). https://fraser.stlouisfed.org/title/6148/item/604114, accessed on May 21, 2024.