Public domain
Motors on a North American B-25 bomber are warmed up before the plane takes off on its initial flight test
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineMotors on a North American B-25 bomber are warmed up before the plane takes off on its initial flight test. 1942-01-01. Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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