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ChemGlobe: Niobium Save
Electronic, thermal, and steric data along with a table of isotopes.
http://partisans.spurious.biz/~pkreme...   

ChemicalElements.com: Niobium Save
Basic information, atomic structure, and isotopes.
http://www.chemicalelements.com/eleme...   

EnvironmentalChemistry.com: Niobium Save
Atomic structure, chemical and physical properties, and table of nuclides.
http://environmentalchemistry.com/yog...   

It's Elemental: Niobium Save
Basic physical and historical information.
http://education.jlab.org/itselementa...   

LANL: Niobium Save
History, sources, properties, and uses.
http://periodic.lanl.gov/elements/41....   

Lenntech: Niobium Save
Physical data, chemical properties, and health effects.
http://www.lenntech.com/Periodic-char...   

Niobium Save
Data tables and historic information.
http://www.scescape.net/~woods/elemen...   

USGS Minerals Information: Niobium Save
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
http://minerals.usgs.gov/minerals/pub...   

Visual Elements: Niobium Save
Image, uses, general information, and ionisation energies.
http://www.chemsoc.org/viselements/pa...   

WebElements: Niobium Save
Extensive information on history, uses, occurrence, compounds, and properties of the element.
http://www.webelements.com/webelement...   

Wikipedia: Niobium Save
Properties of the element, including its history, applications, and characteristics.
http://en.wikipedia.org/wiki/Niobium   

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