Max Planck Institute for Gravitational Physics | Department of Physics University of Alberta |
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"The Occurrence of He 3 in Natural Sources of Helium" | "Impaired exercise ventilatory mechanics with the self-contained breathing apparatus are improved with heliox" |
"Composition of Gas from a Well at Dexter, Kan" | "Helium in Kansas Natural Gas" |
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Proceedings of the Royal Society of London | CRC Handbook of Chemistry and Physics 86th ed |
Witchalls, Clint 18 August 2010.