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USGS Minerals Information: Thallium

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

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ChemicalElements.com: Thallium

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

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It's Elemental: Thallium

http://education.jlab.org/itselemental/ele081.html

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WebElements: Tellurium

http://www.webelements.com/tellurium/

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Radiochemistry of Tellurium

http://library.lanl.gov/cgi-bin/getfile?rc000049.pdf

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