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    Academic Journal
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    Academic Journal

    Authors: Wu, Yajun1, wyjdldz@163.com, Xu, Fang2, Yuan, Mei1, Sun, Dean1

    Source: Environmental Earth Sciences; Feb2016, Vol. 75 Issue 3, p1-22, 22p

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    Academic Journal

    Source: Science in China. Series E: Technological Sciences; Oct2007 Supplement, Vol. 50, p125-135, 11p

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    Academic Journal

    Source: Educational Theory; Jul1960, Vol. 10 Issue 3, p217-223, 7p