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WebElements: Niobium -
Extensive information on history, uses, occurrence, compounds, and properties of the element.
http://www.webelements.com/webelements/elements/text/Nb/key.html Visual Elements: Niobium -
Image, uses, general information, and ionisation energies.
http://www.chemsoc.org/viselements/pages/niobium.html USGS Minerals Information: Niobium -
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
http://minerals.usgs.gov/minerals/pubs/commodity/niobium/ Wikipedia: Niobium -
Properties of the element, including its history, applications, and characteristics.
http://en.wikipedia.org/wiki/Niobium ChemGlobe: Niobium -
Electronic, thermal, and steric data along with a table of isotopes.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/41.html EnvironmentalChemistry.com: Niobium -
Atomic structure, chemical and physical properties, and table of nuclides.
http://environmentalchemistry.com/yogi/periodic/Nb.html ChemicalElements.com: Niobium -
Basic information, atomic structure, and isotopes.
http://www.chemicalelements.com/elements/nb.html LANL: Niobium -
History, sources, properties, and uses.
http://periodic.lanl.gov/elements/41.html Lenntech: Niobium -
Physical data, chemical properties, and health effects.
http://www.lenntech.com/Periodic-chart-elements/Nb-en.htm It's Elemental: Niobium -
Basic physical and historical information.
http://education.jlab.org/itselemental/ele041.html
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