كتاب جغرافية المناخ والنبات

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٣٤- Wooldridge, S. W. and R. S. Morgan, "Outlines of Geomorphology". Longmans, Green and Co. Inc. New York, ١٩٣٧.

٣٥- Von Engeln, ٠. D. "Geomoiphology". The Macmillan Company, New York. ١٩٤٢.