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Find relevant articles on wikipedia, follow the weblinks at the bottom.
Use specialty search engines that cluster results or show them visually to see what's at the center of a web on a subject. Try clusty.com or vivisimo.com for clustering, Kartoo.com for visual organization. Try it for a subject you know well to see how it works. Kartoo will show you the dozen most relevant, interlinked sites on a subject in seconds.
treeline