In the essay Propaganda and Persuasion, the following two images are among those that writer Estelle Jussim specifically refers to in her discussion of how photographs function as propaganda.  (Scroll down for the second photograph.)

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Russell Lee, Instruction at Home, Transylvania, Louisiana, 1939 (US)

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Dorothea Lange, Tractored Out, Childress County, 1938 (US)