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United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services, March 2012, BEA 12-19, CB 12-82, FT-900 (12-03)," Bureau of Economic Analysis (BEA) News Releases (May 10, 2012). https://fraser.stlouisfed.org/title/6148/item/601333, accessed on May 16, 2024.