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-- Google SEO News and Discussion
---- Massive drop in Google rankings due to spidering issues
phranque - 1:39 pm on Mar 24, 2013 (gmt 0)Thread source:: http://www.webmasterworld.com/google/4557758.htm
instead of excluding those urls from being crawled you might want to consider redirecting non-canonical requests to the canonical urls using a 301 status code.
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