The photograph shows the ammonia cracker and scrubbers at the Haber synthetic ammonia catalyst testing plant located at the American University in Washington, It was taken on January 30, 1920, by Sgt. Hitz and is labeled with the official number 67763.

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Size: 8457px × 5781px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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