Selenium
Links
Radiochemistry of Selenium
http://lib-www.lanl.gov/cgi-bin/getfile?rc000058.pdf
Full text of the monograph by V. J. Molinski (Union Carbide Corporation, Mining and Metals Division, Research Center, Tuxedo, New York) and G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF]
It's Elemental: Selenium
http://education.jlab.org/itselemental/ele034.html
Basic physical and historical information.
ChemicalElements.com: Selenium
http://www.chemicalelements.com/elements/se.html
Basic information, atomic structure, and isotopes.
USGS Minerals Information: Selenium
http://minerals.usgs.gov/minerals/pubs/commodity/selenium/
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
Selenium
http://www.scescape.net/~woods/elements/selenium.html
Data tables and historic information.
Visual Elements: Selenium
http://www.chemsoc.org/viselements/pages/selenium.html
Image, general and physical information, source, uses, key isotopes, and ionisation energies.
EnvironmentalChemistry.com: Selenium
http://environmentalchemistry.com/yogi/periodic/Se.html
Atomic structure, chemical and physical properties, and table of nuclides.
WebElements: Selenium
http://www.webelements.com/webelements/elements/text/Se/key.html
Extensive information on history, uses, occurrence, compounds, and properties of the element.
Wikipedia: Selenium
http://www.wikipedia.org/wiki/Selenium
Properties of the element, including its history, applications, and charateristics.
Lenntech: Selenium
http://www.lenntech.com/Periodic-chart-elements/Se-en.htm
Physical data, chemical properties, health and environmental effects.