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Quelle: Foto 1: http://commons.wikimedia.org/wiki/Image:Liriodendron_tulipifera0.jpg http://en.wikipedia.org/wiki/GNU_Free_Documentation_License Foto 2: http://commons.wikimedia.org/wiki/Image:Liriodendron_tulipifera2.jpg http://en.wikipedia.org/wiki/GNU_Free_Documentation_License Foto 3: http://commons.wikimedia.org/wiki/Image:Liriodendron_tulipifera3.jpg http://en.wikipedia.org/wiki/GNU_Free_Documentation_License Foto 4: http://commons.wikimedia.org/wiki/Image:Liriodendron_Tulipifera_Fruit-and-Seed.jpg http://en.wikipedia.org/wiki/Public_domain |