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Wikipedia page on helium
The New York Times: The Global Helium Shortage Is Real, but Don't Blame Party Balloons
The US Research Community's Liquid Helium Crisis. An action plan to preserve US innovation, 2016
Edison – Helium the Macro view, December 2017
GeoScientist, January 2018, Helium Hero or Houdini
Cryogenic Impact Report, March 2015
Air Products: Helium conversion factors
Airlander
Independent: Why is the World Running out of Helium?
Google Loon
Chemistry World: 150 Years of Helium
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