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Philosophy

Internet Encyclopedia of Philosophy

www.utm.edu/research/iep/ -  "Articles in the Internet Encyclopedia of Philosophy are currently from three sources (1) adaptations from public domain sources, (2) adaptations of material written by the editor for classroom purposes, and (3) original contributions by professional philosophers around the internet."

Stanford  Encyclopedia of Philosophy

http://plato.stanford.edu/ -  "...the first dynamic encyclopedia. In a dynamic encyclopedia, each entry is maintained and kept up to date by an expert or group of experts in the field..."