GEOGRAPHICAL RESEARCH ›› 1988, Vol. 7 ›› Issue (4): 106-108.doi: 10.11821/yj1988040014
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URL: http://www.dlyj.ac.cn/EN/10.11821/yj1988040014
http://www.dlyj.ac.cn/EN/Y1988/V7/I4/106
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