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n+1 Number Nineteen
n+1, Benjamin Kunkel, Nell Zink, David Auerbach, Srinath Perur, Kristin Dombek, Ross Perlin, Nikil Saval, Andrew Jacobs, Sophie Pinkham, Jedediah Purd2014

National Geographic Science Forces and Motion Physical Science Grade 1 Teacher's Edition
Randy Bell Ph D2010