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The Periodic Table of the Elements

from WebElements


Atomic Weights and Isotopic Compositions 

from the National Institute of Standards & Technology


Fundamental Physical Constants 

from the National Institute of Standards & Technology


International System of Units 

from the National Institute of Standards & Technology


Atomic Spectroscopy Data 

from the National Institute of Standards & Technology


Molecular Spectroscopic Data 

from the National Institute of Standards & Technology