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| 1 | The world environment 1972-1992 : two decades of challenge / edited by Mostafa K. Tolba, Osama A. El-Kholy ; in association with E. El-Hinnawi [et al.]. — reimp. — Nairobi ; London : United Nations Environment Programme ; Chapman & Hall, 1993. — 884 p. : fig., tab., gráf. ; 24 cm. — |  |
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