TY - PROGRESS IN GEOGRAPHY A1 - T1 - Y1 - 1986-08-25 00:00:00.0 JF - PROGRESS IN GEOGRAPHY JO - PROGRESS IN GEOGRAPHY SP - 63 EP - 63 VL - 5 IS - 3 UR - {https://www.progressingeography.com/EN/10.11820/dlkxjz.1986.03.016} N1 - 10.11820/dlkxjz.1986.03.016 ER -