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Silica resources of the Philippines : <Including specifications and benefication>
Cruz, Amable J., (1980)
Asbestos
Bowles, Oliver, (1937)
The Canadian silica industry
Collings, R. K., (1956)
Arsenic : World survey of production, consumption and prices with special reference to future trends
(1973)
Kyanite, andalusite, sillimanite and allied minerals : World survey of production, consumption and prices with special reference to future trends
Bromine : world survey of production consumption and prices
(1975)