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Lenntech: Helium
Physical data, chemical properties, and health effects.
It's Elemental: Helium
Basic physical and historical information.
LANL: Helium
History, sources, properties, and uses.
Corrosionsource.com: Helium
History, sources, properties, isotopes, and uses.
USGS Minerals Information: Helium
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
ChemGlobe: Helium
Electronic, thermal, and steric data along with basic information.
EnvironmentalChemistry.com: Helium
Atomic structure, chemical and physical properties, and table of nuclides.
Wikipedia: Helium
Properties of the element, including its history, applications, and charateristics.
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