แผนพัฒนาทรัพยากรแร่และพลังงานในแผนพัฒนาเศรษฐกิจและสังคมแห่งชาติ ฉบับที่ 6

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ลิขสิทธิ์ (c) 1991 The Journal of Metals, Materials and Minerals (JMMM)

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