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