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1990 №6 : The state of Transboundary Air Pollution: 1989 update : report prepared within the framework of the Convertion on Long-range Transboundary Air Pollution / United Nations. - N.Y. : [б.в.], 1990.. - 86 p. (Air Pollution Studies, ISSN 1014-4625 ; 1990 №6). - Библиогр.: 85-86. - ISBN 92-1-116489-3