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USGS Minerals Information: Selenium
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
ChemGlobe: Selenium
Electronic, thermal, and steric data along with an isotope table.
Selenium
Data tables and historic information.
It's Elemental: Selenium
Basic physical and historical information.
EnvironmentalChemistry.com: Selenium
Atomic structure, chemical and physical properties, and table of nuclides.
Lenntech: Selenium
Physical data, chemical properties, health and environmental effects.
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