Nationalgeographic.com. National Geographic. 5/21/08. http://animals.nationalgeographic.com/animals/birds/mallard-duck.html
The Superior Waters Project 5/21/08 http://wildernessclassroom.com/superior/Mallard-male.jpg
www.na.fs.fed.us US Forest Service 5/21/08 http://www.na.fs.fed.us/pubs/silvics_manual/volume_1/pinus/contorta.htm
www.images.google.com Tree and Stub Guide 5/22/08 http://shand.saskpower.com/images/greenhouse/seedguide/lodgepolepine.gif
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