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- ChemGlobe: Barium - - Electronic, thermal, and steric data, along with an isotope table.
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- Lenntech: Barium - - Physical data, chemical properties, health and environmental effects.
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- WebElements: Barium - - Extensive information on history, uses, occurrence, compounds, and properties.
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- Wikipedia: Barium - - Properties of the element, including its history, applications, and characteristics.
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