TY  - BOOK
ED  - IHD-WHO Working Group on Quality of Water.
TI  - Water quality surveys : : a guide for the collection and interpreta tion of water quality data / 
SN  - 9231014730
PY  - 1978///
CY  - Paris : 
PB  - Unesco , 
KW  - Water quality
KW  - Measurement
N1  -  Includes bibliographies
ER  -