Number of items:
1
.
Mathis, John Samuel
(1956)
The Abundance of Helium Relative to Hydrogen in the Orion Nebula.
Dissertation (Ph.D.), California Institute of Technology.
doi:10.7907/CB4D-4026.
https://resolver.caltech.edu/CaltechETD:etd-06072004-163340
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Wed Dec 17 12:05:24 2025 UTC
.