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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. 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/

  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/

  RefScout A weekly, scientific reference mailing service. http://www.refscout.com/