ChemGlobe: Lead - Electronic, thermal, and steric data along with an isotope table.
ChemicalElements.com: Lead - Basic information, atomic structure, and isotopes table.
EnvironmentalChemistry.com: Lead - Atomic structure, chemical and physical properties, and table of nuclides.
It's Elemental: Lead - Basic physical and historical information.
LANL: Lead - Properties, forms, uses, and handling.
Lenntech: Lead - Physical data, chemical properties, health and environmental effects.
USGS Minerals Information: Lead - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
Visual Elements: Lead - Image, uses, physical information, and key isotopes.
Wikipedia: Lead - Properties of the element, including its history, applications, and characteristics.
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