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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/
The Constants and Equations Pages
Expanding reference resource for science, math and astronomy
http://www.tcaep.co.uk/
Studies Made Easy
Offers homework help, math tricks, science news, periodic table, and a discussion forum.
http://www.beta-theta.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.
http://www.refscout.com/
GrayLIT Network
Searchable database for reports that are generated by federally funded projects.
http://www.osti.gov/graylit/
Astronomical Constants from NASA
Astronomical/space constants and equations.
http://www.ksc.nasa.gov/facts/faq04.html
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