TY  - BOOK
AU  - World health organization
TI  - Guidelines for drinking - water quality 
SN  - 9789241548151
U1  - 363.61 
PY  - 2011///
CY  - Geneva 
PB  - World health organization
KW  - Water quality standards
KW  - Drinking water quality
KW  - Potable water
N1  - One copy price USD 137.00, exchange rate 1 USD = 155.34 LKR on the date of 8/11/2017
ER  -