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United States. Department of Commerce. "U.S. International Trade in Goods and Services: February 2015 : Tables, BEA 15-16, CB 15-62, FT-900 (15-02)," United States Department of Commerce News (April 2, 2015). https://fraser.stlouisfed.org/title/6148/item/602234/content/xls/bea_newsreleases_20150402_tables-only, accessed on June 1, 2026.