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Shakespeare Oxford Society: Beginner's Guide to Shakespeare Authorship Problem
This site from the Shakespeare Oxford Society contains a great deal of information in support of the theory that Edwared de Vere, the Earl of Oxford, actually wrote the works traditionally attributed to Shakespeare.
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The Shakespeare Authorship Page
This site, by a renowned Shakespeare scholar, systematically refutes arguments made by people who argue that someone other than William Shakespeare, most notably the Earl of Oxford, wrote the works of William Shakespeare.