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