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History 2 Agriculture 1 Conditions sociales 1 Conservation of natural resources 1 Crises économiques 1 Depressions 1 Droughts 1 more ... Dust Bowl Era, 1931-1939 1 Dust Bowl, États-Unis, 1931-1939 1 Dust storms 1 Ecologische aspecten 1 Histoire 1 Jordbrukspolitik 1 Ländlicher Raum 1 New Deal 1 New Deal, 1933-1939 1 Plattelandsontwikkeling 1 Politics and government 1 Politique et gouvernement 1 Sécheresses 1 Social conditions 1 Tempêtes de poussière 1 Umwelt 1 historia 1 less ...

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