It's Elemental: Hafnium - Basic physical and historical information.
ChemicalElements.com: Hafnium - Basic information, atomic structure, and isotopes.
EnvironmentalChemistry.com: Hafnium - Atomic structure, chemical and physical properties, and table of nuclides.
Lenntech: Hafnium - Physical data, chemical properties, health and environmental effects.
Wikipedia: Hafnium - Properties of the element, including its history, applications, and characteristics.
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