See also:

• Science: Chemistry: Elements: Noble Gases  (2)

• 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.

ODP - Open Directory Project : Help build the most comprehensive human-reviewed directory of the web.