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See also:
- ChemGlobe: Helium - Electronic, thermal, and steric data along with basic information.
- ChemicalElements.com: Helium - Basic information, atomic structure, and table of isotopes.
- Corrosionsource.com: Helium - History, sources, properties, isotopes, and uses.
- EnvironmentalChemistry.com: Helium - Atomic structure, chemical and physical properties, and table of nuclides.
- Especiál Gas Inc.: Helium - Numeric data, uses, and general information.
- It's Elemental: Helium - Basic physical and historical information.
- LANL: Helium - History, sources, properties, and uses.
- Lenntech: Helium - Physical data, chemical properties, and health effects.
- USGS Minerals Information: Helium - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
- Visual Elements: Helium - Image, animation, discovery, uses, physical information, and key isotopes.
- WebElements: Helium - Extensive information on history, uses, occurrence, and properties of the element.
- Wikipedia: Helium - Properties of the element, including its history, applications, and characteristics.
