Osmium
Links
Radiochemistry of Osmium
http://lib-www.lanl.gov/cgi-bin/getfile?rc000023.pdf
Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF]
It's Elemental: Osmium
http://education.jlab.org/itselemental/ele076.html
Basic physical and historical information.
ChemicalElements.com: Osmium
http://www.chemicalelements.com/elements/os.html
Basic information, atomic structure, and isotopes.
Visual Elements: Osmium
http://www.chemsoc.org/viselements/pages/osmium.html
General and physical information, source, uses, key isotopes, and ionisation energies.
EnvironmentalChemistry.com: Osmium
http://environmentalchemistry.com/yogi/periodic/Os.html
Atomic structure, chemical and physical properties, and table of nuclides.
WebElements: Osmium
http://www.webelements.com/webelements/elements/text/Os/key.html
Extensive information on history, uses, occurrence, compounds, and properties.
Wikipedia: Osmium
http://www.wikipedia.org/wiki/Osmium
Properties of the element, including its history, applications, and charateristics.
Lenntech: Osmium
http://www.lenntech.com/Periodic-chart-elements/Os-en.htm
Physical data, chemical properties, health and environmental effects.