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ChemGlobe: Strontium
Electronic, thermal, and steric data along with an isotope table.
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/38.html
ChemicalElements.com: Strontium
Basic information, atomic structure, and isotopes.
http://www.chemicalelements.com/elements/sr.html
EnvironmentalChemistry.com: Strontium
Atomic structure, chemical and physical properties, and table of nuclides.
http://environmentalchemistry.com/yogi/periodic/Sr.html
It's Elemental: Strontium
Basic physical and historical information.
http://education.jlab.org/itselemental/ele038.html
LANL: Strontium
History, forms, properties, isotopes, and uses.
http://periodic.lanl.gov/elements/38.html
Lenntech: Strontium
Physical data, chemical properties, health and environmental effects.
http://www.lenntech.com/Periodic-chart-elements/Sr-en.htm
USGS Minerals Information: Strontium
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
http://minerals.usgs.gov/minerals/pubs/commodity/strontium/
Visual Elements: Strontium
Uses, physical information, key isotopes, and ionisation energies.
http://www.chemsoc.org/viselements/pages/strontium.html
WebElements: Strontium
Extensive information on history, uses, occurrence, compounds, and properties of the element.
http://www.webelements.com/webelements/elements/text/Sr/key.html
Wikipedia: Strontium
Properties of the element, including its history, applications, and characteristics.
http://en.wikipedia.org/wiki/Strontium
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