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Astronomical Constants from NASA
Contains astronomical/space constants and equations.
http://www.ksc.nasa.gov/facts/faq04.html
Beta-Theta
Gives general defintions, background and examples from the science fields of biology, physics, chemistry, math, and history. Includes forum boards.
http://www.beta-theta.com/
CalcTool
Directory of simply-presented javascript calculators and equations for making common calculations. Provides quick, simple online calculation and unit conversion tools.
http://www.calctool.org/
The Constants and Equations Pages
Expands reference resources for science, maths, and astronomy.
http://www.scenta.co.uk/tcaep/
DOE Community
Searchable database for reports that are generated by federally funded projects.
http://www.osti.gov/doecommunity/
Eformulae.com
Online resource providing engineering, science, math, physics and chemistry formulae for reference.
http://www.eformulae.com
RefScout
A weekly, scientific reference mailing service.
http://www.refscout.com/
Science and Engineering Encyclopedia
Descriptions, equations, calculators, conversions and material data for engineering, mathematics, physics and chemistry.
http://www.diracdelta.co.uk
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