الفهرس 
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Abstract
this study was carried out at the institute of water, soil and air (Institut fur wasser-, Boden _und Lufthygiiene des Bundesgesundheisamtes (BGA ) during the period form january 1988 until march 1990, in coperation with both of institute of ecology ( Institut fur ok1ogie ) technica1 university ”tu” Ber1in, west germany and Department of Anima1 Production, Facu1ty of Agricu1ture, Assiut Univer-sity .