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This is a vintage hardcover book titled "Principles of Aircraft Engines" by Bert A. Shields, published in 1942.
This book likely covers topics related to engineering and workings of aircraft of the time.
With its collectible nature and historical significance, it could be a valuable addition to any library or collection focusing on aviation or engineering history.
Book has wear and markings on covers and page edges, see photos closely for condition. Pages seem to be well intact. This is an ex library copy and has a library stamp in front and back.