Strahler, Arthur N.
Physical geography
John Wiley & Sons, 1975
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Duckson, Don W.
Exercise in physical geography
McGraw-HIll, 1999
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Strahler, Arthur N.
Modern physical geography
John Wiley & Sons, 1983
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Trewartha, Glenn T.
Physical elements of geography
McGraw-Hill, 1967
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Hidore, John J.
Physical geography : earth systems
Scott, Foresman, 1974
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