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Lenntech: Osmium

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

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EnvironmentalChemistry.com: Osmium

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

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ChemicalElements.com: Osmium

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

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It's Elemental: Osmium

http://education.jlab.org/itselemental/ele076.html

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WebElements: Technetium

http://www.webelements.com/technetium/

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Radiochemistry of Technetium

http://library.lanl.gov/cgi-bin/getfile?rc000035.pdf

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Wikipedia: Technetium

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

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EnvironmentalChemistry.com: Technetium

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

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ChemicalElements.com: Technetium

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

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