TY  - BOOK
TI  - Water quality surveys: a guide for the collection and interpretation of water quality data 
SN  - 9231014730
U1  - 543.3 
PY  - 1978///
CY  - Paris
PB  - Unesco 
KW  - Water quality
KW  - Water quality--Measurement
N1  - Includes bibliographical reference
ER  -