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