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. 1916 Apr;2(4):216–224. doi: 10.1073/pnas.2.4.216

The Abundance of the Elements in Relation to the Hydrogen-Helium Structure of the Atoms

William D Harkins 1
PMCID: PMC1090987  PMID: 16586611

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Wright W. H. Outlines of a Proposed System of Classification of the Nebulae by Means of their Spectra. Proc Natl Acad Sci U S A. 1915 Dec;1(12):590–595. doi: 10.1073/pnas.1.12.590. [DOI] [PMC free article] [PubMed] [Google Scholar]

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