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Street, J. A. "١٩٦٩": The Unstable Earth, London.

Strahler, A.N". "١٩٦٩": Physical Geography, New York.

Strahler, A.N. and Strahler, AH. "١٩٧٩": Elements of Physical Geography, New York.

Thornbury, W.D. "١٩٥٨": Principles of Geomorphology, New York.

Trewartha, G.T. and Others "١٩٦٥": Fundamentals of Physical Geography, London.

Trewartha, G.T. "١٩٦٨": An Introduction to Climate, New York.

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