Castillo, L. The minerals industry symposium of the 61st ANMSEC. Portal : your insight into the Philippine mining industry.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCastillo, Lio. "The Minerals Industry Symposium of the 61st ANMSEC." Portal : Your Insight into the Philippine Mining Industry .
एमएलए (9वां संस्करण) प्रशस्ति पत्रCastillo, Lio. "The Minerals Industry Symposium of the 61st ANMSEC." Portal : Your Insight into the Philippine Mining Industry, .
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