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EnvironmentalChemistry.com: Tin

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

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USGS Minerals Information: Tin

http://minerals.usgs.gov/minerals/pubs/commodity/tin/

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ChemicalElements.com: Tin

http://www.chemicalelements.com/elements/sn.html

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It's Elemental: Tin

http://education.jlab.org/itselemental/ele050.html

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WebElements: Uranium

http://www.webelements.com/uranium/

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The Element Uranium

http://dhost.info/aquatsr/uranium/

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