PROGRESS IN GEOGRAPHY ›› 2000, Vol. 19 ›› Issue (3): 285-288.doi: 10.11820/dlkxjz.2000.03.013

• Original Articles • Previous Articles    

  

  • Received:2000-06-01 Revised:2000-08-01 Online:2000-08-24 Published:2000-08-24

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