"The Blue Eagle, a blue-colored representation of the American thunderbird, with outspread wings, was a symbol used in the United States by companies to show compliance with the National Industrial Recovery Act. It was proclaimed the symbol of industrial recovery on July 20, 1933 by Hugh Samuel Johnson, the head of the National Recovery Administration"--Wikipedia.
Copyright is owned by the "Ding" Darling Wildlife Society; it is administered on behalf of the Society by The University of Iowa. While use within the classroom is encouraged without specific authorization, publishing this cartoon in any format requires written permission. See policy and permissions procedure at: http://www.lib.uiowa.edu/spec-coll/services/dingdarling_fees.html