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(2002). Harcourt Science. Orlando, Florida: Harcourt School Publishers. Dahl, Michael (1996). Inclined Planes. Mankato, MN: Bridgestone Books.Dahl, Michael (1996). Wheels and Axles. Mankato, MN: Bridgestone Books.Glover, David (1997). Levers. United Kingdom: Rigby Interactive Library. Glover, David (1997). Pulleys and Gears. United Kingdom: Rigby Interactive Library. Glover, David (1997). Screws. United Kingdom: Rigby Interactive Library. Harcourt Science . Georgia. Orlando: Harcourt School Publishers, 2002. Nankivell-Aston, Sally (2000). Science Experiments With Simple Machines. New York NY: Franklin Watts. "Simple Machines." EdHeads. 2007. Martha Holden Jennings Foundation. 27 Mar 2007 <http://www.edheads.org/activities/simple-machines/ >. "Simple Machines." inQuiry Almanack. The Franklin Institute Resources for Science Learning. 27 Mar 2007 <http://sln.fi.edu/qa97/spotlight3/spotlight3.html>. "Simple Machines." Simple Machines. ThinkQuest. 27 Mar 2007 <http://library.thinkquest.org/J002079F/sub3.htm>. Tocci, Salvatore (2003). Experiments With Simple Machines. New York NY: Children's Press."Types of Machines." FactMonster. Information Please. 27 Mar 2007 <http://www.factmonster.com/ce6/sci/A0859409.html>.
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