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يحيي محمد احمد عثمان
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Issue Date
Title
Author(s)
1991
اقتصاديات انتاج محصول القطن فى المزارع المتباينه السعه واقتصاديات نقله من مراكز التجميع الى المحالج فى محافظه بنى سويف
يحيي محمد احمد عثمان
