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URL: http://books.google.com/books?id=GCEYAAAAYAAJ (Google Books. Digitalisiert: 2. April 2008, Vorlage: New York Public Library) [G; PDF]
URL: http://books.google.com/books?id=RbYyBAW-ahkC (Google Books. Digitalisiert: 12. Okt. 2009, Vorlage: Univ. of Michigan) [ePub; G; PDF]