Observation building at the Mount Wilson observing post of the US Army Balloon School in Arcadia, California. This photograph was taken on December 21, 1918, by a DMA photographer. The building served as a vital location for observation and training during World War I.

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Size: 8492px × 5673px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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