Caption: "Langley Field's Aviation Experiment Station in Virginia during World War I. This image, numbered 111-SC-5631, shows the construction of a hydrogen plant on December 15, 1918. It was released by to the Photo Division of the Signal Corps on February 28, 1918. (Photo taken by Surect Photographer, subject to approval)."

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Size: 9182px × 6303px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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