1
Published: Hamburg, DVAG, 1990
   
4
Published: Bochum, Dt. Verband f. Angewandte Geographie, 1989
   
6
Published: Bonn, Kuron, 1978-2001
   
7
   
8
Published: Berlin, Springer, 1997-
   
11
Published: Heidelberg, Springer Spektrum, 1977-
   
14
   
17
Published: Bochum, Dt. Verb. f. Angewandte Geographie , 1985
   
18
Published: Essen, Kommunalverband Ruhrgebiet, 1981
   
20
   

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