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"Cenozoic Era." UCMP. University of California Museum of Paleontology, n.d. Web. 17 Nov. 2014.
Ghose, Tia. "Mesozoic Era: The Age of Reptiles." Live Science. Purch, n.d. Web. 12 Nov. 2014.
Hamilton, Jason. "The Cenozoic Era." Science Views. Calvin & Rosanna Hamilton, n.d. Web. 17 Nov. 2014.
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"The Mesozoic Era." UCMP. University of California Museum of Paleontology, n.d. Web. 17 Nov. 2014.
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"Paleozoic Era." PBS. PBS, n.d. Web. 12 Nov. 2014.
Pappas, Stephanie. "Paleozoic Era: Facts & Information." Live Science. Purch, 19 June 2013. Web. 12 Nov. 2014.
"Precambrian Time." National Geographic. National Geographic Society, n.d. Web. 5 Nov. 2014.
Zimmermann, Kim Ann. "Cenozoic Era: Facts about climate,animals & Plants." Live Science. Purch, 10 Oct. 2013. Web. 17 Nov. 2014.
"Cenozoic Era." UCMP. University of California Museum of Paleontology, n.d. Web. 17 Nov. 2014.
Ghose, Tia. "Mesozoic Era: The Age of Reptiles." Live Science. Purch, n.d. Web. 12 Nov. 2014.
Hamilton, Jason. "The Cenozoic Era." Science Views. Calvin & Rosanna Hamilton, n.d. Web. 17 Nov. 2014.
- - -. "The Paleozoic Era." Science Views. N.p., n.d. Web. 12 Nov. 2014.
"The Mesozoic Era." UCMP. University of California Museum of Paleontology, n.d. Web. 17 Nov. 2014.
"The Paleozoic." UCMP. University of California Museum of Paleontology, n.d. Web. 12 Dec. 2014.
"Paleozoic Era." PBS. PBS, n.d. Web. 12 Nov. 2014.
Pappas, Stephanie. "Paleozoic Era: Facts & Information." Live Science. Purch, 19 June 2013. Web. 12 Nov. 2014.
"Precambrian Time." National Geographic. National Geographic Society, n.d. Web. 5 Nov. 2014.
Zimmermann, Kim Ann. "Cenozoic Era: Facts about climate,animals & Plants." Live Science. Purch, 10 Oct. 2013. Web. 17 Nov. 2014.