How Letterboxing Works


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Sources

  • Atlas Quest http://www.atlasquest.com
  • Granstrom, Chris. "They live and breathe letterboxing." Smithsonian, Vol. 29 Issue 1, 1998.
  • Letterboxing North America http://www.letterboxing.org
  • Letterboxing 101 http://www.letterboxing.org/GettingStarted/Letterboxing101.pdf
  • Letterboxing.Info http://www.letterboxing.info