GEOGRAPHICAL RESEARCH ›› 1984, Vol. 3 ›› Issue (3): 111-114,116.doi: 10.11821/yj1984030011
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URL: http://www.dlyj.ac.cn/EN/10.11821/yj1984030011
http://www.dlyj.ac.cn/EN/Y1984/V3/I3/111
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