Soldiers working at the Signal Corps Field Laboratory in Washington , March 3, 1919. This photo shows the southwest aspect of the laboratory. Please note that this image is issued and held by the US government, not for publication. Sergeant Gray was the photographer.

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Size: 8525px × 5681px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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