- ChemicalElements.com: Iridium - http://www.chemicalelements.com/elements/ir.html
- Basic information, atomic structure, and table of isotopes.
- It's Elemental: Iridium - http://education.jlab.org/itselemental/ele077.html
- Basic physical and historical information.
- Visual Elements: Iridium - http://www.chemsoc.org/viselements/pages/iridium.html
- Image, general and physical information, source, uses, key isotopes, and ionisation energies.
- EnvironmentalChemistry.com: Iridium - http://environmentalchemistry.com/yogi/periodic/ir.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Iridium - http://www.lenntech.com/periodic-chart-elements/ir-en.htm
- Physical data, chemical properties, health and environmental effects.
- Wikipedia: Iridium - http://en.wikipedia.org/wiki/iridium
- Properties of the element, including its history, applications, and characteristics.
- LANL: Iridium - http://periodic.lanl.gov/elements/77.html
- History, properties, uses, and sources.
- ChemGlobe: Iridium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/77.html
- Electronic, thermal, and steric data along with an isotope table.
- Radiochemistry of Iridium - http://library.lanl.gov/cgi-bin/getfile?rc000027.pdf
- Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee).
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