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This research guide identifies materials for basic and advanced research in philosophy. It lists a variety of sources, including databases, reference works, and Internet sites useful for the study of philosophy.
Created and maintained by a professor at the University of Oxford, this site serves as a gateway to philosophy sources on the Internet. Organized around 14 main categories (e.g., "Reference," "Individual Philosophers").
"...a comprehensive directory of online philosophical articles and books by academic philosophers" (website description). Some features require that users must first create a free account. Jointly sponsored by the University of London and Australian National University.
An excellent metasite for the humanities and social sciences. Maintained at the University of California, Santa Barbara, VoS (the title comes from a little-known passage in Aristotle's Poetics) offers deep research links in more than 25 categories. Also offers helpful links to online journals, conferences, publishers, libraries, and museums. The "Philosophy" section includes a listing of Web sites organized primarily around specific philosophers.