Freshwater pollution /
Wheal, Caroline.
Freshwater pollution / [text, Caroline Wheal]. - Nairobi : UNEP, 1991. - 36 p. : ill., maps ; 26 cm. - UNEP/GEMS environment library ; no. 6 .
Cover title. "Based on Global freshwater quality (Blackwell, 1990) and other sources"--T.p. verso.
Includes bibliographical references (p. 35-36).
92981260
Water--Pollution.
Water-supply.
TD 425 / .F74
363.73/94
Freshwater pollution / [text, Caroline Wheal]. - Nairobi : UNEP, 1991. - 36 p. : ill., maps ; 26 cm. - UNEP/GEMS environment library ; no. 6 .
Cover title. "Based on Global freshwater quality (Blackwell, 1990) and other sources"--T.p. verso.
Includes bibliographical references (p. 35-36).
92981260
Water--Pollution.
Water-supply.
TD 425 / .F74
363.73/94