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Reference & Resources

EquationSheet.com

Searchable directory, arranged by field, of equations, constants, symbols and SI units. Also features LaTEX utilities, software links.
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Beta-Theta

Gives general defintions, background and examples from the science fields of biology, physics, chemistry, math, and history. Includes forum boards.
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Wikimedia Foundation (12)

Learn more about the Wikimedia Foundation, dedicated to the development and distribution of free content, including its sites Wikipedia, Wikiquote, Wikisource, Wikibooks, and Wiktionary.
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