- Visual Elements: Holmium - http://www.chemsoc.org/viselements/pages/holmium.html
- Image, source, uses, key isotopes, and ionisation energies.
- ChemicalElements.com: Holmium - http://www.chemicalelements.com/elements/ho.html
- Basic information, atomic structure, and isotopes table.
- It's Elemental: Holmium - http://education.jlab.org/itselemental/ele067.html
- Basic physical and historical information.
- EnvironmentalChemistry.com: Holmium - http://environmentalchemistry.com/yogi/periodic/ho.html
- Atomic structure, chemical and physical properties, and table of nuclides.
- Lenntech: Holmium - http://www.lenntech.com/periodic-chart-elements/ho-en.htm
- Physical data, chemical properties, health and environmental effects.
- Wikipedia: Holmium - http://en.wikipedia.org/wiki/holmium
- Properties of the element, including its history, applications, and characteristics.
- LANL: Holmium - http://periodic.lanl.gov/elements/67.html
- Basic information, history, and properties.
- ChemGlobe: Holmium - http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/67.html
- Electronic, thermal, and steric data along with an isotope table.
- WebElements: Holmium - http://www.webelements.com/webelements/elements/text/ho/key.html
- Extensive information on history, uses, occurrence, compounds, and properties.
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