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Geometry Formulas and Facts Link: http://geom.math.uiuc.edu/docs/reference/CRCformulas

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The Mathematical Atlas: A gateway to the areas of modern mathematics and to resources for those areas Link: http://www.math.niu.edu/~rusin/knownmath/welcome.html

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Hand picked directory of online Mathematics resources Link: http://www.educationindex.com/math

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