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USGS Minerals Information: Tungsten
Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
minerals.usgs.gov/

EnvironmentalChemistry.com: Tungsten
Atomic structure, chemical and physical properties, and table of nuclides.
environmentalchemistry.com/

ChemicalElements.com: Tungsten
Basic information, atomic structure, and isotopes.
www.chemicalelements.com/

It's Elemental: Tungsten
Basic physical and historical information.
education.jlab.org/

Radiochemistry of Tungsten
Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF]
lib-www.lanl.gov/

Lenntech: Tungsten
Physical data, chemical properties, health and environmental effects.
www.lenntech.com/

WebElements: Tungsten
Extensive information on history, uses, occurrence, compounds, and properties.
www.webelements.com/

Wikipedia: Tungsten
Properties of the element, including its history, applications, and characteristics.
en.wikipedia.org/

LANL: Tungsten
Basic information and history.
periodic.lanl.gov/

ChemGlobe: Tungsten
Electronic, thermal, and steric data along with an isotope table.
partisans.spurious.biz/