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See also:
 | - ChemGlobe: Hafnium
- Electronic, thermal, and steric data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/72.html
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 | - It's Elemental: Hafnium
- Basic physical and historical information.
http://education.jlab.org/itselemental/ele072.html
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 | - LANL: Hafnium
- History, properties, uses, and handling.
http://periodic.lanl.gov/elements/72.html
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 | - Lenntech: Hafnium
- Physical data, chemical properties, health and environmental effects.
http://www.lenntech.com/Periodic-chart-elements/Hf-en.htm
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 | - Visual Elements: Hafnium
- General and physical information, source, uses, key isotopes, and ionisation energies.
http://www.chemsoc.org/viselements/pages/hafnium.html
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 | - Wikipedia: Hafnium
- Properties of the element, including its history, applications, and characteristics.
http://en.wikipedia.org/wiki/Hafnium
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