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Online version of McGraw-Hill Encyclopedia of Science and Technology, 10th ed. 2007 plus updates.
Eric Weisstein's World of Science
Contains encyclopedias in the areas of chemistry, physics, astronomy and science biography. Also includes Wolfram MathWorld.
Free, online mathematics encyclopedia.
Oxford Dictionary of Statistics
All aspects of statistics including terms used in computing, mathematics, operational research, and probability, as well as biographical information on over 200 key figures in the field.