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Crises économiques 3 Depressions 3 History 3 Agriculture 1 Conditions sociales 1 Conservation programs 1 Droughts 1 more ... Dust Bowl Era, 1931-1939 1 Dust Bowl, États-Unis, 1931-1939 1 Dust storms 1 Forests and forestry 1 Governmental programs and projects 1 Histoire 1 Sécheresses 1 Social conditions 1 Soil conservation 1 Tempêtes de poussière 1 less ...

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