TY - PROGRESS IN GEOGRAPHY A1 - T1 - Y1 - 1989-01-24 00:00:00.0 JF - PROGRESS IN GEOGRAPHY JO - PROGRESS IN GEOGRAPHY SP - 29 EP - 32 VL - 8 IS - 1 UR - {https://www.progressingeography.com/EN/10.11820/dlkxjz.1989.01.009} N1 - 10.11820/dlkxjz.1989.01.009 ER -