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Item Studies on chlorine and fluorine in Eppawela apatite(National Science Council:Colombo, 1987) Gunawardane, R.P.Item Studies on complete and partial acidulation of Eppawela apatite(National Science Council:Colombo, 1987) Gunawardane, R.P.Item Fertilizers from Eppawala apatite:conversion using alkali hydroxide and quartz(National Science Council:Colombo, 1987) Gunawardane, R.P.; Annersten, H.