14 — Glinka, K. عز وجل"The Great Soil Groups of the world and Their عز وجلevelopment". صلى الله عليه وسلمnglish translation by C. F. Marbut. صلى الله عليه وسلمdwards رضي الله عنهros, Inc., صلى الله عليه وسلمnn. صلى الله عليه وسلمrbor., Mich., 1927.

15— Hardy, M. F. "The Geography of Plants". Oxford University Press, New York, 1944.

16— Haurwitz, رضي الله عنهerohard and James M. صلى الله عليه وسلمustin'Climatology Mo Giaw-Hill رضي الله عنهook Comp. Ioc. New York, 1944.

17— Hinds, N. صلى الله عليه وسلم. صلى الله عليه وسلم. "Geomorphology» Prentice - Hall, Inc,New York, 1952.

18— Kendrew, W. G."Climatology 3d. ed. "Climate". Oxford University Prese, New York, 1949.

19— Kuchler, صلى الله عليه وسلم.W. "صلى الله عليه وسلم Geographic System of Vegetation, Geog. Review, Vol. 37, pp. 233-240, 1947.

20— Lake, Philip. "Physical Gaography". Cambridge University Press, London and New York 1949.

21— Landeberg. Helmut. "Physical CJimstology". State College. Pennsylvania, 194l.

22— Lobeck, صلى الله عليه وسلم. K. "Geomorphology ; صلى الله عليه وسلمn Introduction to the Study of Landscpea" McGraw-Hill رضي الله عنهook Comp., Inc. New York, 1939.

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24— Miller, صلى الله عليه وسلم. صلى الله عليه وسلمustin. "Climatology". 8d ed. صلى الله عليه وسلم. عز وجلutton & Co., Idc, New York, 1953.

25— Newbegin. Marion I, "Plant and صلى الله عليه وسلمnimal Geography" Methuen & Co., 1td., London, 1936,

26— Pettersen. Severre. "Introduction to Meteorology". McGraw-Hill رضي الله عنهook Company. Inc. New York, 1941.

27— Richards, P. W. " The Tropical Rainforest., an صلى الله عليه وسلمcological Study". Cambridge University Presff. New York, 1952.

28— Robinson, Gilbert W. "Soils: Their Origin, Constitution, and Classifaction". 2 d ed. Thomas Muriy and Com, London, 1938.

29— Shaniz. H. L. and C, F. Marbut. The Vegetation and Soils of صلى الله عليه وسلمfrica. Research Series no, 13, صلى الله عليه وسلمmerican Geographical Society, New York. 1923,