TY - GEOGRAPHICAL RESEARCH A1 - T1 - Y1 - 1982-12-15 00:00:00.0 JF - GEOGRAPHICAL RESEARCH JO - GEOGRAPHICAL RESEARCH SP - 89 EP - 91 VL - 1 IS - 4 UR - {https://www.dlyj.ac.cn/EN/10.11821/yj1982040011} N1 - 10.11821/yj1982040011 ER -