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History 4 Histoire 2 15.85 history of America 1 Agriculture 1 Aufsatzsammlung 1 Cattle 1 Conditions sociales 1 more ... Control 1 Crises économiques 1 DDT (Insecticide) 1 Deforestation 1 Depressions 1 Déboisement 1 Droughts 1 Dust Bowl Era, 1931-1939 1 Dust Bowl, États-Unis, 1931-1939 1 Dust storms 1 Economic conditions 1 Economic history 1 Entwaldung 1 Environmental aspects 1 Histoire économique 1 Insect pests 1 Kongress 1 Landbouwbedrijven 1 Ranching 1 Sécheresses 1 Social conditions 1 Technological innovations 1 Tempêtes de poussière 1 less ...

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