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Minería subterránea (16)
Minería subterránea--Aspectos económicos (5)
Industria minera (4)
Voladuras (Minería) (4)
Minería subterránea--Perforación (3)
Acarreo minero (2)
Industria minera--Perú (2)
Industria minera--Planificación (2)
Ingeniería de minas (2)
Minas--Control de gastos (2)
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