TY - PROGRESS IN GEOGRAPHY A1 - T1 - Y1 - 1982-12-25 00:00:00.0 JF - PROGRESS IN GEOGRAPHY JO - PROGRESS IN GEOGRAPHY SP - 53 EP - 54 VL - 1 IS - 4 UR - {https://www.progressingeography.com/EN/10.11820/dlkxjz.1982.04.019} N1 - 10.11820/dlkxjz.1982.04.019 ER -