• 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.
• Beta-Theta - Gives general defintions, background and examples from the science fields of biology, physics, chemistry, math, and history. Includes forum boards.
• CalcTool - Directory of simply-presented javascript calculators and equations for making common calculations. Provides quick, simple online calculation and unit conversion tools.
• 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.
• Eformulae.com - Online resource providing engineering, science, math, physics and chemistry formulae for reference.
• RefScout - A weekly, scientific reference mailing service.
• Science and Engineering Encyclopedia - Descriptions, equations, calculators, conversions and material data for engineering, mathematics, physics and chemistry.

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• Business: Publishing and Printing: Publishing: Academic and Technical  (149)
• Reference  (58,424)
• Reference: Dictionaries: By Subject  (497)

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