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Office of the Federal Coordinator for Meteorology (2008). "Chapter 2: Definitions"(PDF). NOAA. pp. 2–1. Archived from the original(PDF) on 2009-05-06. Retrieved 2009-05-03.
Office of the Federal Coordinator for Meteorology (2008). "Chapter 2: Definitions"(PDF). NOAA. pp. 2–1. Archived from the original(PDF) on 2009-05-06. Retrieved 2009-05-03.