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"Nitrogen Group." //AbsoluteAstronomy.com//. Wikipedia, 2009. Web. 26 Oct. 2009. .

"Periodic Table." //Rader's CHEM4KIDS.COM//. Web. 26 Oct. 2009. .

"Nitrogen Properties." //Gas Plants,Industrial Gas Plants,Gas Plants Manufacturers,Industrial Gas Plants Exporters//. Gas Plants Manufacturers. Web. 26 Oct. 2009. .

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