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Websites in Reference

1. Astronomical Constants from NASA
   Astronomical/space constants and equations.
   http://www.ksc.nasa.gov/facts/faq04.html
   
   
2. EquationSheet.com
   Searchable directory, arranged by field, of equations, constants, symbols and SI units. Also features LaTEX utilities, software links.
   http://www.equationsheet.com/
   
   
3. GrayLIT Network
   Searchable database for reports that are generated by federally funded projects.
   http://www.osti.gov/graylit/
   
   
4. Physics and Science Reference by PhysLINK.com
   Includes physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations.
   http://www.physlink.com/Reference/Index.cfm
   
   
5. 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/
   
   
6. The Constants and Equations Pages
   Expanding reference resource for science, math and astronomy
   http://www.tcaep.co.uk/
   
   

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