TY - GEOGRAPHICAL RESEARCH A1 - T1 - Y1 - 1988-06-15 00:00:00.0 JF - GEOGRAPHICAL RESEARCH JO - GEOGRAPHICAL RESEARCH SP - 94 EP - 102 VL - 7 IS - 2 UR - {https://www.dlyj.ac.cn/EN/10.11821/yj1988020012} N1 - 10.11821/yj1988020012 ER -