3
   
5
   
7
   
11
Published: Bad Godesberg, Bundesanst. f. Landeskunde u. Raumforschung, 1966
   
15
Published: Innsbruck, Univ. Press, 2008
   
17
Published: Regensburg, Selbstverlag Institut für Geographie an der Universität Regensburg, 1989
   
19
   
20
Published: Nürnberg, Wirtschafts- u. Sozialgeogr. Inst. d. Friedrich-Alexander Univ., 1969
   

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