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It's Elemental: Americium

http://education.jlab.org/itselemental/ele095.html

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EnvironmentalChemistry.com: Americium

http://environmentalchemistry.com/yogi/periodic/Am.html

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WebElements: Antimony

http://www.webelements.com/antimony/

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Radiochemistry of Antimony

http://library.lanl.gov/cgi-bin/getfile?rc000057.pdf

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Wikipedia: Antimony

http://en.wikipedia.org/wiki/Antimony

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Lenntech: Antimony

http://www.lenntech.com/Periodic-chart-elements/Sb-en.htm

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