2
   
6
   
7
Published: Nürnberg, Wirtschafts- u. Sozialgeogr. Inst. d. Friedrich-Alexander Univ., 1969
   
8
Published: Hamburg, Diplomarbeiten-Agentur, 1999
   
9
   
10
   
17
Published: Regensburg, Selbstverlag Institut für Geographie an der Universität Regensburg, 1989
   
19
   

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