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• Reference  (56,304)
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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.
• Beta+Theta - Gives general definitions, 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.
• Knovel - Online reference collection used by applied scientists and practicing engineers to quickly locate technical information.
• RefScout - A weekly, scientific reference mailing service.
• Science and Engineering Encyclopedia - Descriptions, equations, calculators, conversions and material data for engineering, mathematics, physics and chemistry.