المراجع

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1— صلى الله عليه وسلمckerman, صلى الله عليه وسلمdward صلى الله عليه وسلم. «The Koppen Classification oF Climates in North صلى الله عليه وسلمmerica*, Geog. Rev., Vol. .31, pp. 105— 111, 1941.

2- رضي الله عنهailey. Harry P. · صلى الله عليه وسلم Simple moisture Index based Upon a Primary law of صلى الله عليه وسلمvaporation". Geografiska صلى الله عليه وسلمnnaler, 1958. Hafte 3-4, pp. 196-215.

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4— رضي الله عنهlair, Thomas صلى الله عليه وسلم. -Weather صلى الله عليه وسلمlements-. 3d. ed Prentice Hall, Inc. New York. 1948.

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8— Cain, Stanley صلى الله عليه وسلم " Foundations of Plant Geography. Harper & رضي الله عنهrother, New York, 1944,

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