GEOGRAPHICAL RESEARCH ›› 1992, Vol. 11 ›› Issue (4): 117-117.doi: 10.11821/yj1992040014
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URL: http://www.dlyj.ac.cn/EN/10.11821/yj1992040014
http://www.dlyj.ac.cn/EN/Y1992/V11/I4/117
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