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Britannica Nobel Prize: Helium - Detailed overview and data.
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.
Wikipedia: Helium - Properties of the element, including its history, applications, and characteristics.