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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.
Thulium
Data tables and historic information.
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.