- The Math Forum
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Combined archive and portal to web resources, educational issues, help forums, mailing lists, and teaching materials.
Science/Math
 http://www.mathforum.org
- The Mathematical Atlas
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Dave Rusin's survey of research-level mathematics, with introductory articles for non-mathematicians and hyperlinked bibliographies in each of dozens of research areas.
Science/Math
http://www.math.niu.edu/~rusin/known-math/
- Mathematics Archives
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Combined archive and directory of mathematics web sites, mailing lists, and teaching materials.
Science/Math
http://archives.math.utk.edu
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