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Economic conditions
Condiciones económicas
3
History
2
Social conditions
2
Blacks
1
Blue collar workers
1
Comunidades indígenas
1
Condiciones sociales
1
Distillation
1
Economic aspects
1
Employment
1
Engineers
1
Environmental aspects
1
Environmental conditions
1
Environmental policy
1
Environmental protection
1
Foreign study
1
Gestión de minería
1
Government policy
1
Historia
1
Household employees
1
Indians of South America
1
Indigenous peoples
1
Ingeniería minera
1
Mine management
1
Mines and mineral resources
1
Mining engineering
1
Mujeres inmigrantes
1
Mujeres trabajadoras
1
Negros
1
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1
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2
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3
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4
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6