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Published: Sankt Augustin : Konrad-Adenauer-Stiftung, 1996
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Published: Sankt Augustin : Konrad-Adenauer-Stiftung, 1994
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Published: Zürich [u.a.] : Amalthea-Verl, 1930
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Published: Frankfurt am Main : Fischer, 1982
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Published: München : Olzog, 1998
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