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I also recommend going to the website [http://www.pjatr.com/t/Qj1BR0JAPUFFSERHPUNFQg Qj1BR0FEPUFFSERHPUNFQg SEOMOZ] and purchasing their article called The Professional's Keyword Research Guide which is a 75-page guide on keyword research. When you go to that webpage at [http://www.pjatr.com/t/Qj1BR0FEPUFFSERHPUNFQg SEOMOZ] click on the top menu bar called "search engine guides".