TY  - BOOK
AU  - Ott,Watne R.
ED  - United States.
TI  - Water quality indices: a survey of indices used in the United States 
U1  - 333.91 
PY  - 1978///
CY  - Washington, D.C.
PB  - U.S. Environmental Protection Agency
KW  - Water-supply
ER  -