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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. —
	2		Transboundary movements and disposal of hazardous wastes in international law : basic documents / edited by Barbara Kwiatkowska, Alfred H. A. Soons ; preface by Mostafa K. Tolba . — Dordrecht : Martinus Nijhoff / Graham & Trotman, [1993]. — 1386 p. ; 25 cm. — ( International environmental law and policy)