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I do have duplicate content issues that I believe Iíve corrected in the past week with 301 redirects. Iím also working on changing meta descriptions/keywords to be more unique.
If I had recently made big changes to my site I could at least pinpoint the drop to something I had done but the truth is I havenít really made any big changes to the site in 2 years. I add 10-20 pages of new content everyday.
Where do I even start to determine the corrections that I need to make to bring my site back?
Here are some reference threads that offer plenty of food for thought:
Supplemental Results - What exactly are they? [webmasterworld.com]
Duplicate Content - Get it right or perish [webmasterworld.com]
Checklist for Sudden Drops in Rank [webmasterworld.com]
Dropped from Google - a checklist to find out why [webmasterworld.com]
Dropped Site Checklist [webmasterworld.com]
The url-only problem [webmasterworld.com]