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Image: US Helium Production and Storage 1940-2014

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Description: Helium production and storage in the United States, 1940-2014 (data from USGS)
Title: US Helium Production and Storage 1940-2014
Credit: Own work
Author: Plazak
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes

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