See also:

• Health: Animal: Alternative Medicine: Oxygen Therapy  (2)
• Science: Chemistry: Elements: Nonmetals  (4)
• Shopping: Health: Alternative: Oxygen and Ozone  (9)

• ChemGlobe: Oxygen - Electronic, thermal, and steric data along with basic information.
• ChemicalElements.com: Oxygen - Basic information, atomic structure, and table of isotopes.
• EnvironmentalChemistry.com: Oxygen - Atomic structure, chemical and physical properties, and table of nuclides.
• Especiál Gas Inc.: Oxygen - Numeric data, uses, and general information.
• It's Elemental: Oxygen - Basic physical and historical information.
• LANL: Oxygen - History, sources, forms, compounds, and isotopes.
• Lenntech: Oxygen - Physical data, chemical properties, and health effects.
• Visual Elements: Oxygen - Animation, uses, physical information, and key isotopes.
• WebElements: Oxygen - Information on history, uses, occurrence, compounds, and properties of the element.
• Wikipedia: Oxygen - Properties of the element, including its history, applications, and characteristics.