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Catholic Educator's Resource Center
A great portal site for Catholic educators, provideding articles and links on many different areas of Catholicism.
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Xenos Christian Fellowship: Roman Catholicism
History, beliefs, ordinances, and many other details of the Roman Catholic Church, as presented by an evangelical group, Xenos Christian Fellowship.
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Catholic Exchange
A very large resource with dozens of channels and articles all realted to the Catholic faith. In addition, there are a large number of columnists listed.