File:Balloons - Helium Plants - Development of helium work carried on under direction of the Bureau of Mines. Exterior of main Plant Building, located three miles north of Petrolia, Texas - NARA - 20807998.jpg

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current02:43, 22 September 2017Thumbnail for version as of 02:43, 22 September 20175,362 × 3,560 (11.47 MB)commons>US National Archives botBot-assisted upload of US National Archives Identifer 20807998.

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