1921 - 2012, President of the Internat. Union for Conservation of Nature (1978-1984); and adviser to UNEP. Emeritus prof.; Univ. of Cairo (1987)
1921 - 2012, President of the Internat. Union for Conservation of Nature (1978-1984); and adviser to UNEP. Emeritus prof.; Univ. of Cairo (1987)