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Where's the best place to look to find prior art? Obviously you can search old patents and The Internet Archive is extremely helpful. Are there any other places that are best suited for finding really good prior art?
You may use libraries, books, presentations, magazines, videos, thesis, research papers, trade fair publications, etc etc. This list is endless. Depends on technology fields.
I can suggest the Google Book Search - it does turn up obscure titles which otherwise may not be available for research, especially out-of-print books and they even have some magazine archives.