2
Published: Bonn-Bad Godesberg, Forschungsinst. d. Friedrich-Ebert Stiftung, 1976
   
3
   
4
Published: Münster, Verl. Westfälisches Dampfboot, 1989
   
5
Published: Bonn, Friedrich-Ebert-Stiftung, 1991
   
8
Published: Garbsen, Calenberg Press, Juli 1992
   
10
   

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