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"Ordovician Period". Encyclopædia Britannica. Encyclopædia Britannica Online.
Encyclopædia Britannica Inc., 2016. Web. 02 Nov. 2016
<https://www.britannica.com/science/Ordovician-Period/Animals>.
"Ordovician Period". Encyclopædia Britannica. Encyclopædia Britannica Online.
Encyclopædia Britannica Inc., 2016. Web. 02 Nov. 2016
<https://www.britannica.com/science/Ordovician-Period/Paleoclimate>
YouTube.com. (2016). [online] Available at: https://youtu.be/plK8xBOF73g.
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