Skateboards, roller coasters, and playground slides, all of these are ramps. From award-winning author Michael Dahl, this book provides an introduction to one of the most important machines humans rely on. With fun facts, find out how people use ramps every day.
(Tags : Roll, Slope, and Slide: A Book About Ramps (Unabridged) Michael Dahl & Denise Shea Audiobook, Michael Dahl & Denise Shea Audio CD )
