TY - PROGRESS IN GEOGRAPHY A1 - T1 - Y1 - 1992-08-25 00:00:00.0 JF - PROGRESS IN GEOGRAPHY JO - PROGRESS IN GEOGRAPHY SP - 14 EP - 18 VL - 11 IS - 3 UR - {https://www.progressingeography.com/EN/10.11820/dlkxjz.1992.03.003} N1 - 10.11820/dlkxjz.1992.03.003 ER -