Browsing by Author "Upawansa, G.K."
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Item Biogas system for Sri Lanka(Sri Lanka energy Managers Association, 1989) Upawansa, G.K.Item Design Improvement to the Bottle LampUpawansa, G.K.Item Traditional cultivation systems and appropriate technology(Natinal Resources, Energy Science Authority of Sri Lanka:Colombo, 1991) Upawansa, G.K.