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Mineral resources of Cavite Province
(1980)
Decentralization, institutional ambiguity, and mineral resource conflict in Mindanao, Philippines
Verbrugge, Boris, (2015)
Alcune industrie di rilevante interesse per la Regione Toscana
Barbier, Enrico, (1993)
Silica resources of the Philippines : <Including specifications and benefication>
Cruz, Amable J., (1980)
Semi-precious gemstones and exotic minerals which may serve as indigenious raw materials for Philippine jewelry
Cruz, Amable J., (1981)