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by Shel Brannan

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Brannan, Shel.  "How the First-Down Line Works"  26 January 2001.  HowStuffWorks.com. <http://entertainment.howstuffworks.com/first-down-line.htm>  10 February 2012.
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Inside this Article
  1. Introduction to How the First-Down Line Works
  2. The Technology
  3. Drawing the Line
  1. Lots More Information
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