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sri lanka badulla district haldummulla
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1990
L. K. National W. Ratmalana
and
IRC International Water and Sanitation Centre, The Hague, NL
,
“
A manual on operation and maintenance for community water supply systems
”
. National Water Supply and Drainage Board, Ratmalana, Sri Lanka, p. 76 p. : ill., maps, 1990.
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