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National Weather Service Forecast Office, Columbia, South Carolina (27. 1. 2009.). „Hail...”. National Weather Service Eastern Region Headquarters. Pristupljeno 28. 8. 2009.
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Glossary of Meteorology (2009). „Hail”. American Meteorological Society. Arhivirano iz originala na datum 2010-07-25. Pristupljeno 15. 7. 2009.