00340nam a2200121Ia 450000500170000000800410001702000180005805000190007610000160009524500560011126000310016765000200019820251229085506.0251229s9999    xx            000 0 und d  a9780521446303  aGF 75 .E22 C.3  aTurner,B.L. 4aThe earth as transformed by human action.cL Turner  aCambridge Univ.Pressb1990  aHuman Geography