00482nam a2200169Ia 4500 180921t2009 xxu||||| |||| 00| 0 sin d sin 591.5 JAY Jayewardena,Sarathchandra. පරිසර පද්ධති කළමනාකරණය Parisara Paddathi Kalamanakaranaya S.Godage Colombo 2009 78p., 21 cm BK 0 0 0 0 SCI MAIN MAIN 2023-06-11 591.5 JAY P34969 2023-06-11 2023-06-11 BK 14115 14115 LK-CoDNM LK-CoDNM LK-CoDNM LK-CoDNM