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Lenntech: Germanium

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

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EnvironmentalChemistry.com: Germanium

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

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USGS Minerals Information: Germanium

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

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ChemicalElements.com: Germanium

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

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It's Elemental: Germanium

http://education.jlab.org/itselemental/ele032.html

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