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1Published 1994“...United Nations,...”
Conference Proceeding Book -
2Published 1992“...United Nations,...”
Conference Proceeding Book -
3ECE Symposium on problems relating to environment : proceedings and documentation of the Symposium /Published 1971“...United Nations,...”
Book -
4Published 1987“...United Nations Environmental Programme,...”
Book -
5
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6Published 2000“...The United Nations University Press,...”
Book -
7by Levin, Aida Luisa“...United Nations Institute for Training and Research,...”
Published 1977
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8Published 1993“...United Nations Dept. of Public Information,...”
Conference Proceeding Book