See also:
 | - ChemGlobe: Oxygen - - Electronic, thermal, and steric data along with basic information.
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 | - LANL: Oxygen - - History, sources, forms, compounds, and isotopes.
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 | - WebElements: Oxygen - - Information on history, uses, occurrence, compounds, and properties of the element.
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 | - Wikipedia: Oxygen - - Properties of the element, including its history, applications, and characteristics.
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