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United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services, Annual Revision for 2006 : Tables, BEA 07-26, CB 07-82, FT-900 (07-04)," Bureau of Economic Analysis (BEA) News Releases (June 8, 2007). https://fraser.stlouisfed.org/title/6148/item/598967/content/xls/bea_newsreleases_20070608b_tables, accessed on March 22, 2025.