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Google, Yahoo & Microsoft Unite On “Canonical Tag†To Reduce Duplicate Content Clutter
searchengineland.com/canonical-tag-16537, posted 2009 by peter in development google html search webdesign
Specify the canonical version using a tag in the head section of the page as follows: <link rel="canonical" href="http://www.example.com/product.php?item=swedish-fish"/> That’s it!