όζο πατινάζ Αισιοδοξία strata control Πολίτης Αλλαξε ρούχα αχρησιμοποίητος
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Principle of strata control in solid waste backfill mining. | Download Scientific Diagram
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Mine workers in strata control area, Eastern Platinum Mine, Lonmin, Marikana, South Africa | UCT Libraries Digital Collections