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DENR Secretary Reyes stops Biak-na-Bato marble quarrying.
Julkaisussa Manila Bulletin (2006)Artikkeli -
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Secretary alvarez takes action against tea rose marble smugglers
Julkaisussa Manila Times (2001)Artikkeli -
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Marble Corporation of the Philippines a production and operations management study
Julkaistu 1999Opinnäyte -
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