The state of transboundary air pollution /
United Nations.Economic Commission for Europe.
Convention on Long-range Transboundary Air Pollution.
New York : United Nations,
1989-
Vol. published 1989 has subtitle: Effects and control.
"Report prepared within the framework of the Convention on Long- range Transboundary Air Pollution."
Vols. published 1990-93 called Updates.
Transboundary pollution.
Air