See also:

• Science: Chemistry: Elements: Lanthanides  (2)

ChemGlobe: Holmium - Electronic, thermal, and steric data along with an isotope table..

ChemicalElements.com: Holmium - Basic information, atomic structure, and isotopes table..

EnvironmentalChemistry.com: Holmium - Atomic structure, chemical and physical properties, and table of nuclides..

It's Elemental: Holmium - Basic physical and historical information..

LANL: Holmium - Basic information, history, and properties..

Lenntech: Holmium - Physical data, chemical properties, health and environmental effects..

Visual Elements: Holmium - Image, source, uses, key isotopes, and ionisation energies..

WebElements: Holmium - Extensive information on history, uses, occurrence, compounds, and properties..

Wikipedia: Holmium - Properties of the element, including its history, applications, and characteristics..