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Directory Sites

Astronomical Constants from NASA
Astronomical/space constants and equations.
www.ksc.nasa.gov
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.
www.refscout.com
The Constants and Equations Pages
Expanding reference resource for science, math and astronomy
www.tcaep.co.uk
GrayLIT Network
Searchable database for reports that are generated by federally funded projects.
www.osti.gov
EquationSheet.com
Searchable directory, arranged by field, of equations, constants, symbols and SI units. Also features LaTEX utilities, software links.
www.equationsheet.com
Physics and Science Reference by PhysLINK.com
Includes physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations.
www.physlink.com
Beta-Theta
Gives general defintions, background and examples from the science fields of biology, physics, chemistry, math, and history. Includes forum boards.
www.beta-theta.com

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