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EquationSheet.com Searchable directory, arranged by field, of equations, constants, symbols and SI units. Also features LaTEX utilities, software links. http://www.equationsheet.com/
Erik Max Francis' physics pages "Information on Kepler's laws, the laws list, illustrated orders of magnitude, a physics reference, and more.
Physics and Science Reference by PhysLINK.com Physics / science reference, physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations. http://www.physlink.com/
RefScout "A weekly, scientific reference mailing service. Screens databases covering life and medical sciences for the key words or the combination of key words specified and will automatically update with any abstract that has come up during the last seven days. Free service.
The Founders Classical mechanics is a model of the physics of forces acting upon bodies. http://www.about-physicists.org/
