- Equation Sheets
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Searchable directory, arranged by field, of equations, constants, symbols and SI units. Also features LaTEX utilities, software links.
Science/Reference
http://www.equationsheet.com
- Physics and Science Reference
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Includes physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations.
Science/Reference
http://www.physlink.com/Reference/Index.cfm
- Beta Theta
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Gives general defintions, background and examples from the science fields of biology, physics, chemistry, math, and history.
Science/Reference
http://www.beta-theta.com
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