See also:
- Physics and Science Reference by PhysLINK.com
 - Physics / science reference, physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations and more. - Acoustic material property tables - Specialty Engineering Associates
- Astronomical constants from NASA - Astronomical/space constants and equations
- Biocatalysis/Biodegradation Database - University of Minnesota Biocatalysis/Biodegradation Database lists microbial biocatalytic reactions and biodegradation pathways primarily for xenobiotic, chemical compounds.
- Favorite Mathematical Constants - Mathematical constants from Steven Finch and Mathsoft
- Fundamental Physical Constants from NIST - CODATA Internationally recommended values for a wide range of physical parameters (speed of light, Avogadro's constant, masses of elementary particles, Planck constant, acceleration of gravity, etc.)
- Institute for Scientific Information (ISI) - Scientific publication databases
- NIST General Tables of Units of Measurement
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