From the case:
Will Rogers (photo)
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Photo of Will Rogers whose quip "When the Okies left Oklahoma and moved to California, they raised the average intelligence level in both states." inspired the naming of the stage migration the Will Rogers phenomenon.
This image is available from the United States Library of Congress's Prints and Photographs division under the digital ID cph.3a21749. According to the library, there are no known copyright restrictions on the use of this work.