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The lessons in the unit explore the film script of The Plow that Broke the Plains , a New Deal documentary on the drought and Dust Bowl ; John Steinbeck 's The Harvest Gypsies , feature stories on the condition of migrant workers ; John Ford 's classic movie The Grapes of Wrath based on Steinbeck 's popular novel ; and the New Deal 's " Living Newspaper " plays " Power " and " One Third of a Nation " promoting New Deal programs . His music for Pare Lorentz 's documentary film The Plow that Broke the Plains ( 1936 ) was a milestone in American composition . The Stokowski recording of The Plow that Broke the Plains , however , is more than just interesting . Last semester , the projects included analyses of Hoover Dam , the invention of country music , Vanity Fair magazine , the Chrysler Building , Charlie Chaplin , Gone With the Wind and Absalom , Absalom , a comparison of the Depression in The United States and in Europe , and on two of Pare Lorenz 's documentary films , The Plow that Broke the Plains and The River .