6
   
7
Published: New York, NY [u.a.], Oxford Univ. Press, 1987
   
8
   
10
Published: Schloß Bleckede, Meissner, 1975
   
11
   
12
   
14
   
16
Published: Geesthacht, GKSS-Forschungszentrum, Bibliothek, 2006
   
18
Published: Düsseldorf, Selbstverl. des Geogr. Inst. der Univ., 1974
   
20
   

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