ChemicalElements.com: Holmium - Basic information, atomic structure, and isotopes table.
It's Elemental: Holmium - Basic physical and historical information.
EnvironmentalChemistry.com: Holmium - Atomic structure, chemical and physical properties, and table of nuclides.
Lenntech: Holmium - Physical data, chemical properties, health and environmental effects.
Wikipedia: Holmium - Properties of the element, including its history, applications, and characteristics.
WebElements: Holmium - Extensive information on history, uses, occurrence, compounds, and properties.
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