Busca y prepara los resultados

	1		Air-borne sulphur pollution : effects and control / Economic Commission for Europe . — New York : United Nations, 1994. — 265 p. : il., tab., gráf. ; 30 cm. — ( Air pollution studies ; 1)
	2		Naciones Unidas. Comisión Económica para Europa Assessment of long-range transboundary air pollution : report prepared within the framework of the convention on long-range transboundary air pollution / Economic Commission for Europe . — New York : United Nations, 1991. — 94 p. : tab. ; 30 cm. — ( Air pollution studies ; 7)
	3		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 ; 5)
	4		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 ; 6)