Reference

Astronomical Constants from NASA - Contains astronomical/space constants and equations.
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.
www.beta-theta.com/

The Constants and Equations Pages - Expands reference resources for science, maths, and astronomy.
www.scenta.co.uk/tcaep/

DOE Community - Searchable database for reports that are generated by federally funded projects.
www.osti.gov/doecommunity/

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