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Andy Wood (November 10, 2008). "Spotter Report Data Quality" (Report). Warning Decision Training Branch. p. 4. Archived from the original on March 11, 2010. Retrieved January 10, 2010.
National Weather Service Twin Cities, MN (April 22, 2010). "Severe Weather Awareness Week". National Oceanic and Atmospheric Administration. Archived from the original on April 26, 2010. Retrieved December 15, 2010.
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