File:CoP-photo.jpg

Aerial photograph (likely enhanced) of the Centennial of Progress world's fair with the Graf Zeppelin in the skies overhead.

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Source: http://alphabetilately.org/Cisfor/CoP/CoP-photo-50.jpg

Copyright: 1933 Chicago Aerial Survey Company (Current-day Recon Optical) Recon Optical, [1]

Fair use rationale: Image is intended only to convey information regarding the subject in question. Image is lower resolution than original. Use of image does not detract from sales. Historically unique image is not replaceable except by another fair use image, and cannot be recreated as the event in question took place in 1933-34.