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See also:
- ChemGlobe: Thulium - Electronic, thermal, and steric data along with an isotope table.
- ChemicalElements.com: Thulium - Basic information, atomic structure, and isotopes.
- EnvironmentalChemistry.com: Thulium - Atomic structure, chemical and physical properties, and table of nuclides.
- It's Elemental: Thulium - Basic physical and historical information.
- LANL: Thulium - Basic information and history.
- Lenntech: Thulium - Physical data, chemical properties, health and environmental effects.
- Visual Elements: Thulium - Image, uses, physical information, and ionisation energies.
- WebElements: Thulium - Extensive information on history, uses, occurrence, compounds, and properties.
- Wikipedia: Thulium - Properties of the element, including its history, applications, and characteristics.
