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World resources 1990-91 : : a report by the World Resources Institute ; in collaboration with the United Nations Environment Programme and the United Nations Development Programme....

Published 1990

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2

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World resources 1986 : : a report by The World Resources Institute and The International Institute for Environment and Development..

Published 1986

3

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World development report 1992 : development and the environment [by the World Bank]..

Published 1992