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URL: http://books.google.com/books?id=N0YCAAAAYAAJ (Google Books. Digitalisiert: 16. Mai 2007, Vorlage: New York Public Library) [G; PDF]
URL: http://books.google.com/books?id=3BOSmfl1WNUC (Google Books. Vorlage: Stanford Univ.) [G; PDF]
URL: http://books.google.com/books?id=NIQpAAAAYAAJ (Google Books. Digitalisiert: 11. Juli 2008, Vorlage: Harvard Univ.) [G; PDF]
URL: http://hdl.handle.net/2027/nyp.33433082301429 (HTDL, Vorlage: New York Public Library) [G; PDF]
[DDC: 950.06]