Image:Boeing Y1B-9 test flight USAF p29.jpg

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Boeing Y1B-9 test flight, 1932.

[edit] Licensing

Public domain This image or file is a work of a U.S. Air Force Airman or employee, taken or made during the course of the person's official duties. As a work of the U.S. federal government, the image or file is in the public domain.
Subject to disclaimers.

Source: USAF photo Scanned from Page 29 of the following book. Photo caption explicitly credits this as a US Air Force photo, and front matter confirms that all photos are USAF except for those credited differently.

  • McCarthy, James P. (2005). The Air Force, 368pp, Levin, Hugh Lauter Associates.

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