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Physics and Science Reference by PhysLINK.com -  .

- Includes physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations.

Astronomical Constants from NASA - - Contains astronomical/space constants and equations.

Beta-Theta - - Gives general defintions, background and examples from the science fields of biology, physics, chemistry, math, and history. Includes forum boards.

CalcTool - - Directory of simply-presented javascript calculators and equations for making common calculations. Provides quick, simple online calculation and unit conversion tools.

The Constants and Equations Pages - - Expands reference resources for science, maths, and astronomy.

DOE Community - - Searchable database for reports that are generated by federally funded projects.

Eformulae.com - - Online resource providing engineering, science, math, physics and chemistry formulae for reference.

RefScout - - A weekly, scientific reference mailing service.

Science and Engineering Encyclopedia - - Descriptions, equations, calculators, conversions and material data for engineering, mathematics, physics and chemistry.