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ChemGlobe: Lead
Electronic, thermal, and steric data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/82.html
ChemicalElements.com: Lead
Basic information, atomic structure, and isotopes table.
http://www.chemicalelements.com/elements/pb.html
EnvironmentalChemistry.com: Lead
Atomic structure, chemical and physical properties, and table of nuclides.
http://environmentalchemistry.com/yogi/periodic/Pb.html
It's Elemental: Lead
Basic physical and historical information.
http://education.jlab.org/itselemental/ele082.html
LANL: Lead
Properties, forms, uses, and handling.
http://periodic.lanl.gov/elements/82.html
Lenntech: Lead
Physical data, chemical properties, health and environmental effects.
http://www.lenntech.com/Periodic-chart-elements/Pb-en.htm
USGS Minerals Information: Lead
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
http://minerals.usgs.gov/minerals/pubs/commodity/lead/
Visual Elements: Lead
Image, uses, physical information, and key isotopes.
http://www.chemsoc.org/viselements/pages/lead.html
Wikipedia: Lead
Properties of the element, including its history, applications, and characteristics.
http://en.wikipedia.org/wiki/Lead
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