LANL: Tungsten Basic information and history. http://pearl1.lanl.gov/periodic/elements/74.html

Radiochemistry of Tungsten Full text of the monograph by G. W. Leddicotte (Oak Ridge National Laboratory, Oak Ridge, Tennessee). [PDF] http://lib-www.lanl.gov/cgi-bin/getfile?rc000011.pdf

It's Elemental: Tungsten Basic physical and historical information. http://education.jlab.org/itselemental/ele074.html

ChemGlobe: Tungsten Electronic, thermal, and steric data along with an isotope table. http://www.vcs.ethz.ch/chemglobe/ptoe/_/74.html

ChemicalElements.com: Tungsten Basic information, atomic structure, and isotopes. http://www.chemicalelements.com/elements/w.html

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

Tungsten Data tables and historic information. http://www.scescape.net/~woods/elements/tungsten.html

Visual Elements: Tungsten Image, general and physical information, source, uses, key isotopes, and ionisation energies. http://www.chemsoc.org/viselements/pages/tungsten.html

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

WebElements: Tungsten Extensive information on history, uses, occurrence, compounds, and properties. http://www.webelements.com/webelements/elements/text/W/key.html

Wikipedia: Tungsten Properties of the element, including its history, applications, and charateristics. http://www.wikipedia.org/wiki/Tungsten

ChinaTungsten Online Basic properties, compounds, brief history, information about production processes. http://chinatungsten.com/chwurl-2-1.htm

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

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