- It's Elemental: Polonium - http://education.jlab.org/itselemental/ele084.html
- Basic physical and historical information.
- ChemicalElements.com: Polonium - http://www.chemicalelements.com/elements/po.html
- Basic information, atomic structure, and table of isotopes.
- Visual Elements: Polonium - http://www.chemsoc.org/viselements/pages/polonium.html
- Image, general and physical information, source, uses, key isotopes, and ionisation energies.
- EnvironmentalChemistry.com: Polonium - http://environmentalchemistry.com/yogi/periodic/po.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Polonium - http://www.lenntech.com/periodic-chart-elements/po-en.htm
- Physical data, chemical properties, health and environmental effects.
- Wikipedia: Polonium - http://en.wikipedia.org/wiki/polonium
- Properties of the element, including its history, applications, and characteristics.
- LANL: Polonium - http://periodic.lanl.gov/elements/84.html
- Sources, properties, uses, and isotopes.
- ChemGlobe: Polonium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/84.html
- Electronic, thermal, and steric data along with an isotope table.
- WebElements: Polonium - http://www.webelements.com/webelements/elements/text/po/key.html
- Extensive information on history, occurrence, compounds, and properties.
- Radiochemistry of Polonium - http://library.lanl.gov/cgi-bin/getfile?rc000006.pdf
- Full text of the monograph by P. E. Figgins (Mound Laboratory, Miamisburg, Ohio).
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