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Physics and Science Reference by PhysLINK.com: Physics, astronomy and greneral science reference, physical constants, online unit convers. physics, reference, physical constants, unit conversion, periodic table of

- 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.

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The Constants and Equations Pages: - Expands reference resources for science, maths, and astronomy.

DOE Community: - Searchable database for reports that are generated by federally funded projects.

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