කමලදාස, භද්රා
ජලය : ලෝකයේ ජීවය Jalaya : lokaye jeewaya - [Colombo] Kantha Jala Ekamuthuwa [2005] - v, 31p.
9558748013
WATER MANAGEMENT-SRI LANKA
WATER RESOURCES
WATER SUPPLY
556.18 / K3
ජලය : ලෝකයේ ජීවය Jalaya : lokaye jeewaya - [Colombo] Kantha Jala Ekamuthuwa [2005] - v, 31p.
9558748013
WATER MANAGEMENT-SRI LANKA
WATER RESOURCES
WATER SUPPLY
556.18 / K3