A good starting point is Mathematics on the Web: the AMS guide.
Selected Very Useful Resources:
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Reviews and abstracts of mathematical publications:
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MathSciNet, the Web version of Mathematical Reviews, produced by American Mathematical Society (Accessible for Canisius Students and Faculty.)
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Zentralblatt MATH Database, the on-line version of Zentralblatt für Mathematik. It is produced by the Berlin editorial office of FIZ Karlsruhe, in cooperation with European Academies and Mathematical Institutes.
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A list with extensive links to home pages:
Many Useful Resources