KNOWLEDGE LEVEL OF USING THE VIRTUAL EXTENSION AND RESEARCH COMMUNICATION NETWORK (VERCON) AMONG AGRICULTURAL EXTENSION WORKERS IN SOME DISTRICTS OF EL- BEHEIRA GOVERNORATE المستوى المعرفی بإستخدام شبکة إتصال البحوث والإرشاد الزراعی (فیرکون) بین العاملین الإرشادیین فى بعض مراکز محافظة البحیرة
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