Protection of water resources and aquatic ecosystems /
Protection of water resources and aquatic ecosystems /
Economic C ommission for Europe.
- New York : United Nations, 1993.
- v, 50 p. ; 30 cm.
- Water series, no. 1 1020-0886 ; .
"ECE/ENVWA/31." United Nations publication sales no. E.93.II.E.23.
9211165717
94-213607
Water quality management.--Pollution.------
Water --Pollution.------
Aquatic ecology.--Pollution.------
"ECE/ENVWA/31." United Nations publication sales no. E.93.II.E.23.
9211165717
94-213607
Water quality management.--Pollution.------
Water --Pollution.------
Aquatic ecology.--Pollution.------