Strahler, Arthur N.
Elements of physical geography
John Wiley & Sons, 1976
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Strahler, Arthur N.
Elements of physical geography
John Wiley & Sons, 1989
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Strahler, Arthur N.
Physical geography
John Wiley & Sons, 1975
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Trewartha, Glenn T.
Elements of geography : physical and cultural
McGraw-Hill, 1967
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Duckson, Don W.
Exercise in physical geography
McGraw-HIll, 1999
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