The NIST Reference on Constants, Units and Uncertainty Information at the foundation of modern science and technology from the Physical Measurement Laboratory of NIST

CODATA Internationally recommended values of the
Fundamental Physical Constants

Constants
Topics:
Values
Energy
Equivalents
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Background

Constants
Bibliography

Constants,
Units &
Uncertainty
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Latest (2006) values of the constants Version history and disclaimer
  (e.g., electron mass, most misspellings okay)
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NIST Standard Reference Database 121

Online: October 1994   -   Last update: October 2008