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"Ammonite." The Worlds of David Darling. Web. 03 May 2011. <http://www.daviddarling.info/encyclopedia/A/ammonite.html>.
Anitei, Stefan. "More Oxygen Would Mean Giant Insects - Softpedia." Latest News - Softpedia. 11 Oct. 2006. Web. 02 May 2011. <http://news.softpedia.com/news/More-Oxygen-Would-Mean-Giant-Insects-37643.shtml>.
"Asteroid Impacts with Earth." Armageddon Online. Web. 3 May 2011.
"Box Canvas Print of Meganeura - Griffenfly / Giant Dragonfly Prehistoric Reconstruction, 2 Foot from Ardea: Amazon.co.uk: Kitchen & Home." Amazon.co.uk: Low Prices in Electronics, Books, Sports Equipment & More. Web. 03 May 2011. <http://www.amazon.co.uk/Box-Canvas-Print-Meganeura-Reconstruction/dp/B001IRG8T6>.
"Continents at 550 Million Years Ago." Fossils Geological Time and Evolution. Web. 02 May 2011. <http://www.fossilmuseum.net/fossil-art/maps/gondwana/gondwana550mya.htm>.
Divisions of Geologic Time. Web. 03 May 2011. <http://geologictimeunit.blogspot.com/>.
"DRAGONfly | Harvard Magazine Nov-Dec 2007." Harvard Magazine | Your Independent Source for Harvard News since 1898. Nov.-Dec. 2007. Web. 02 May 2011. <http://harvardmagazine.com/2007/11/dragonfly>.
"Earth Floor: Geologic Time." COTF. Web. 29 Apr. 2011. <http://www.cotf.edu/ete/modules/msese/earthsysflr/paleozoic.html>.
"Eurypterida." UCMP. Web. 3 May 2011. <http://www.ucmp.berkeley.edu/arthropoda/chelicerata/eurypterida.html>.
"Everything Dinosaur :: Cambrian Trace Fossils - It Was the Single-Celled Life Forms That Made Them." Everything Dinosaur :: Main Page. Web. 03 May 2011. <http://blog.everythingdinosaur.co.uk/blog/_archives/2008/11/21/3988753.html>.
"Geologic Timeline | PALEOZOIC | Event View." Xtimeline - Explore and Create Free Timelines. Web. 03 May 2011. <http://www.xtimeline.com/evt/view.aspx?id=832657>.
"Get Exclusive News Update on Astrobiology and Planetry Life." Astrobiology Magazine -- The Origin and Evolution of Life in the Universe. Web. 03 May 2011. <http://www.astrobio.net/index.php?option=com_retrospection>.
"Giant Insects Might Reign." Biology-blog.com: The Place for Biology. Web. 03 May 2011. <http://www.biology-blog.com/blogs/permalinks/10-2006/giant-insects-might-reign.html>.
Harrison, Jon F., Alexander Kaiser, and John M. VandenBrooks. "Atmospheric Oxygen Level and the Evolution of Insect Body Size." Proceedings of the Royal Society of Biological Sciences. The Royal Society, 10 Mar. 2010. Web. 1 May 2011. <http://rspb.royalsocietypublishing.org/content/early/2010/03/04/rspb.2010.0001.full>.
Krotz, Dan. "Berkeley Lab’s Advanced Light Source Finds Big Surprise in Paleozoic Scorpion Fossil." News Center. 28 Feb. 2011. Web. 30 Apr. 2011.
Mosher, Dave. "High Oxygen Levels Spawn Monster Dragonflies | Wired Science | Wired.com." Wired.com. 2 Nov. 2010. Web. 02 May 2011. <http://www.wired.com/wiredscience/2010/11/huge-dragonflies-oxygen/>.
Palmer, A. R., and J. Geissman. "The Paleozoic Era." UCMP. Web. 2 May 2011. <http://www.ucmp.berkeley.edu/paleozoic/paleozoic.html>.
"Photos." I6p8.info. Web. 3 May 2011. <http://geologictimeunit.blogspot.com/>.
Pietern, Oliver. "Beautiful Photos Of Insects." Pets - Exotic, Animals, Stories. Web. 03 May 2011. <http://www.petsfoto.com/beautiful-photos-insects/>.
"Science Photo Library." Science Photo Library. Web. 03 May 2011. <http://www.sciencephoto.com/images/download_lo_res.html?id=694420543>.
"YouTube - Gondwanaland." YouTube - Broadcast Yourself. Web. 02 May 2011. <http://www.youtube.com/watch?v=c96mVhSqck0>.
