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Autumn Foliage and tree trunks of quaking aspen trees in he crested butte area of Colorado <http://imagecache2.allposters.com/images/pic/NGSPOD05/111392~Autumn-Foliage-and-Tree-Trunks-of-Quaking-Aspen-Trees-in-the-Crested-Butte-Area-of-Colorado-Posters.jpg>
Ivory, A. 2002. "Cygnus olor" (On-line), Animal Diversity Web. Accessed May 29, 2008 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Cygnus_olor.html.
"Mute Swans." www.google.com. 25 Apr. 2008. roots web. 27 May 2008 http://freepages.genealogy.rootsweb.ancestry.com.
Mute Swan 01, May 12,2008<http://www.birdsofoklahoma.net/images/MuteSwan01.jpg>
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