1
   
3
   
8
Published: Marburg, Hamel, 1931
   
9
   
10
Published: [Tübingen], Studentenwerk, 1934
   
13
Published: Reutlingen, Verl. Die Zukunft, 1947
   
15
   
16
   
17
   
20
Published: Hamburg, Versicherungswissenschaftl. Verein, 1950
   

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