Public domain
Daniel Field, Georgia. Air Service Command. Learning to identify aircraft in a machine which shows models in various positions, against various colored backgrounds, at varying intensities of light and for short or long periods of time
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineDaniel Field, Georgia. Air Service Command. Learning to identify aircraft in a machine which shows models in various positions, against various colored backgrounds, at varying intensities of light and. 1943-01-01. Delano, Jack. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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