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      <marc:subfield code="a">Ng, H. Y. F., </marc:subfield>
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      <marc:subfield code="a">The residence time of the Okanagan mainstem lakes in the Okanagan Valley, B.C. /  </marc:subfield>
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      <marc:subfield code="a">"The average residence time of five of the principal Okanagan lakes was calculated based on the thermal structures in conjunction with the outflows of each lake by using Piontelli and Tonollis' hypothesis (1964)"--Abstract.</marc:subfield>
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      <marc:subfield code="a">Cours d'eau</marc:subfield>
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