It's Elemental: Boron - Basic physical and historical information.
ChemicalElements.com: Boron - Basic information, atomic structure, and table of isotopes.
USGS Minerals Information: Boron - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
Boron - Data tables and historic information.
EnvironmentalChemistry.com: Boron - Atomic structure, chemical and physical properties, and table of nuclides.
Boron - Comprehensive historical data about the element and its compounds.
WebElements: Boron - Extensive information on history, uses, occurrence, compounds, and properties of the element.
Lenntech: Boron - Physical data, chemical properties, health and environmental effects.
BoronWeb - Boron chemistry and links to boron chemists around the world.
Wikipedia: Boron - Properties of the element, including its history, applications, and characteristics.
LANL: Boron - History, sources, uses, and properties.
ChemGlobe: Boron - Electronic, thermal, and steric data, along with general information.
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