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Sources

• Kraeutler, Tom. "Are Gutter Guards Worth the Cost?" (Accessed 12/17/08)
  http://www.walletpop.com/blog/2008/11/04/are-gutter-guards-worth-the-cost/
• Smith, Kelly. "Do Gutter Guards Really Work?" (Accessed 12/17/08)
  http://home-exteriors.suite101.com/article.cfm/do_gutter_guards_really_work