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* About.

Usually constructed from TeX/LaTeX source.

  http://en.wikipedia.org/wiki/Reference_card

* Hosting site.

  http://refcards.com
  http://www.digilife.be/quickreferences/quickrefs.htm
  http://www.cheat-sheets.org
  http://www.addedbytes.com/cheat-sheets/
  http://refcardz.dzone.com/