ජල අර්බුදය හා ජල සම්පත් කළමනාකරණය .

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S-1997-Apr-26-Diwaina.pdf (3.92 MB)

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1997-04-26

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දිවයින, පි. 10

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https://dl-cea.nsf.gov.lk/handle/1/918

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දිවයින

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