Photograph of a dog's tongue and trachea taken during physiological research conducted by Marshall in the Chemical Warfare Service's Research Division. The image shows a panchromatic plate numbered 54490 AU, received on July 12, 1918, from the Chemical Warfare Service.

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Size: 8484px × 5809px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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