This is part 1 of a book on agricultural Extension, communication and training in Yemen - In Arabic -authored by Dr. Ismail A. Muharam and Khalil M. Alsharjabi in 1995. هذا هو الفصل 1 من كتاب الإرشاد والتدريب والإعلام الزراعي في اليمن باللغة العربية، من إعداد وتأليف د. اسماعيل عبدالله محرم وخليل منصور الشرجب
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