1
   
2
Published: Wiesbaden, Statistisches Bundesamt, 1990-2009
   
4
Published: Wiesbaden, Statistisches Bundesamt, 1990-2008
   
5
Published: Bielefeld, Bertelsmann, [2008-2012]
   
7
Published: Frankfurt, M., Bund-Verl., 1996-2010
   
9
   
10
   
11
Published: Bonn, Bundesministerium für Arbeit und Soziales, 2002-
   
12
   
13
   
14
   

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