TY - PROGRESS IN GEOGRAPHY A1 - T1 - Y1 - 1996-04-24 00:00:00.0 JF - PROGRESS IN GEOGRAPHY JO - PROGRESS IN GEOGRAPHY SP - 49 EP - 56 VL - 15 IS - 2 UR - {https://www.progressingeography.com/EN/10.11820/dlkxjz.1996.02.012} N1 - 10.11820/dlkxjz.1996.02.012 ER -