Thorium
- Information about uses, what is thorium, sources, coutries reserves of thorium.
- http://www.thorium.tv

ChemGlobe: Thorium
- Electronic, thermal, and steric data along with an isotope table.
- http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/90.html

LANL: Thorium
- Uses, properties, production, properties.
- http://periodic.lanl.gov/elements/90.html

Wikipedia: Thorium
- Properties of the element, including its history, applications, and characteristics.
- http://en.wikipedia.org/wiki/Thorium

Lenntech: Thorium
- Physical data, chemical properties, health and environmental effects.
- http://www.lenntech.com/Periodic-chart-elements/Th-en.htm

EnvironmentalChemistry.com: Thorium
- Atomic structure, chemical and physical properties, and table of nuclides.
- http://environmentalchemistry.com/yogi/periodic/Th.html

USGS Minerals Information: Thorium
- Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
- http://minerals.usgs.gov/minerals/pubs/commodity/thorium/

ChemicalElements.com: Thorium
- Basic information, atomic structure, and isotopes.
- http://www.chemicalelements.com/elements/th.html

It's Elemental: Thorium
- Basic physical and historical information.
- http://education.jlab.org/itselemental/ele090.html

Visual Elements: Thorium
- Image, general and physical information, and key isotopes.
- http://www.chemsoc.org/viselements/pages/thorium.html