The Role of Agricultural Exhibitions in the Dissemination of Agricultural Innovations to Farmers in South Provinces Upper Egypt" A Case Study on the Valley Exhibition for Modern Agricultural Techniques Seventh 2016" دور المعارض الزراعیة فى نشر المستحدثات الزراعیة لزراع محافظات جنوب صعید مصر"دراسة حالة عن معرض الوادى لتقنیات الزراعة الحدیثة السابع 2016"
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