GEOGRAPHICAL RESEARCH ›› 1987, Vol. 6 ›› Issue (2): 92-92.doi: 10.11821/yj1987020013
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URL: http://www.dlyj.ac.cn/EN/10.11821/yj1987020013
http://www.dlyj.ac.cn/EN/Y1987/V6/I2/92
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