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by Map and Mineral Resources Compilation Project Team, Bassanio S. Vargas, Brigida T. Cruz, Liwliwa G. Salvosa
Bureau of Mines and Geo-Sciences 1980 Report of investigation no. 96
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by Federico E. Miranda, Bassanio S. Vargas
Republic of the Philippines. Dept. of Agriculture and Natural Resources. Bureau of Mines 1966 Report of investigation no. 62
