الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
McCullough (44) mentioned that, the biological control of freshwater snail hosts of schistosomiasis had attracted much attention in recent years, but the efficiency of such bio-contro1 agents had rarely been tested outside laboratory conditions. Abdallh and Nasr ( 67) had, been suggested that, the effective biological control could