TY - PROGRESS IN GEOGRAPHY A1 - T1 - Y1 - 1984-04-25 00:00:00.0 JF - PROGRESS IN GEOGRAPHY JO - PROGRESS IN GEOGRAPHY SP - 7 EP - 10 VL - 3 IS - 2 UR - {https://www.progressingeography.com/EN/10.11820/dlkxjz.1984.02.002} N1 - 10.11820/dlkxjz.1984.02.002 ER -