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| The state of transboundary air pollution : report prepared within the framework of the convention on long-range transboundary air pollution / Economic Comission for Europe . — New York : United Nations, 1989. — 104 p. : tab. ; 30 cm. — ( Air pollution studies ;
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| The state of transboundary air pollution: 1989 update : report prepared within the framework of the convention on long-range transboundary air pollution / Economic Commission for Europe . — New York : United Nations, 1990. — 86 p. : tab. ; 30 cm. — ( Air pollution studies ;
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