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"Ancient Egyptian Inventions." Ancient-egypt-online.com. N.p., n.d. Web. 09 June 2015. <http://www.ancient-egypt-online.com/ancient-egyptian-inventions.html>.
"Ducksters: Education Site." Ducksters: Education Site. N.p., n.d. Web. 09 June 2015. <http://www.ducksters.com/>.
"Ancient Egyptian Inventions." Ancient-egypt-online.com. N.p., n.d. Web. 09 June 2015. <http://www.ancient-egypt-online.com/ancient-egyptian-inventions.html>.