2
   
4
Published: Berlin, Institut für Geographie der Technischen Universität Berlin, 1999
   
6
   
10
Published: Oldenburg, Bibliotheks- und Informationssystem d. Univ. Oldenburg, 1995
   
15
Published: Wiesbaden, Dt. Univ.-Verl. [u.a.], 1991
   

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