Tungsten

International Tungsten Industry Association
The principal aims of the ITIA are to promote the use of tungsten and tungsten products, to provide a regular meeting forumand to collate comprehensive statistics covering tungsten production, processing, consumption and end-uses.
Minor Metal Trade Association
Benefits and promotes the interests of its international membership, comprising companies actively involved in all aspects of the international trade of minor metals in all their various forms.
Midwest Tungsten Service
manufacturer of resistance heated evaporation sources and materials for vacuum evaporation (vacuum metallizing). Website includes lots of information about tungsten, Tungsten wire and vacuum metallizing.
High Temp Metals
Lots of Tungsten technical data, reactivity and information on Mechanical & Physical Properties of the Densimet Alloys.
United States Geological Service
Tungsten Statistics and Information.
The Radiochemistry of Tungsten
Paper from National Academy of Sciences - (PDF file)
EnvironmentalChemistry.com
Comprehensive data on the chemical element Tungsten
Lenntech
Chemical properties, Health effects and Environmental effects of tungsten.
Wikipedia
Definition from open source encyclopedia.
Periodic Table of Elements
Basic information and some history.
Department of Energy's Sandia National Laboratories
A cool tungsten light bulb may be possible - Tungsten photonic lattice changes heat to light.