Boron
Comprehensive historical data about the element and its compounds.
http://www.du.edu/~jcalvert/phys/boron.htm
BoronWeb
Boron chemistry and links to boron chemists around the world.
http://www.chem.leeds.ac.uk/boronweb/
ChemGlobe: Boron
Electronic, thermal, and steric data, along with general information.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/5.html
ChemicalElements.com: Boron
Basic information, atomic structure, and table of isotopes.
http://www.chemicalelements.com/elements/b.html
EnvironmentalChemistry.com: Boron
Atomic structure, chemical and physical properties, and table of nuclides.
http://environmentalchemistry.com/yogi/periodic/B.html
It's Elemental: Boron
Basic physical and historical information.
http://education.jlab.org/itselemental/ele005.html
LANL: Boron
History, sources, uses, and properties.
http://periodic.lanl.gov/elements/5.html
Lenntech: Boron
Physical data, chemical properties, health and environmental effects.
http://www.lenntech.com/Periodic-chart-elements/B-en.htm
USGS Minerals Information: Boron
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
http://minerals.usgs.gov/minerals/pubs/commodity/boron/
Visual Elements: Boron
Image, animation, source, uses, physical information, and covalent bonds.
http://www.chemsoc.org/viselements/pages/boron.html
WebElements: Boron
Extensive information on history, uses, occurrence, compounds, and properties of the element.
http://www.webelements.com/webelements/elements/text/B/key.html
Wikipedia: Boron
Properties of the element, including its history, applications, and characteristics.
http://en.wikipedia.org/wiki/Boron
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