 Atomic Weights and Isotopic Compositions for All Elements by National Institute of Standards and Technology (source code)

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= Atomic Weights and Isotopic Compositions for All Elements by National Institute of Standards and Technology
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NIST Physical Measurement Laboratory. Institutional isotope mass data. Webpage publication date unestablished.

https://physics.nist.gov/cgi-bin/Compositions/stand_alone.pl?ascii=ascii2

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