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Quelle: Fotos 1 und 2 : http://www.pdphoto.org/PictureHome.php public domain Foto 3 : http://commons.wikimedia.org/wiki/Image:Petrified_tree_in_Petrified_Forest.jpg http://en.wikipedia.org/wiki/GNU_Free_Documentation_License Foto 4: http://commons.wikimedia.org/wiki/Image:Petrified_wood_closeup_2.jpg http://en.wikipedia.org/wiki/GNU_Free_Documentation_License |