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- It's Elemental: Niobium Basic physical and historical information.
- ChemicalElements.com: Niobium Basic information, atomic structure, and isotopes.
- USGS Minerals Information: Niobium Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
- EnvironmentalChemistry.com: Niobium Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Niobium Physical data, chemical properties, and health effects.
- Wikipedia: Niobium Properties of the element, including its history, applications, and characteristics.
- WebElements: Niobium Extensive information on history, uses, occurrence, compounds, and properties of the element.