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Six books from the series Get to Know Simple Machines. Titles: Get to Know Inclined Planes (AR 4.1, Lexile 720); Get to Know Levers (AR 3.6, Lexile 610); Get to Know Pulleys (AR 4.1, Lexile 700); Get to Know Screws (AR 4.3, Lexile 750); Get to Know Wedges (AR 4.1. Lexile 730); and Get to Know Wheels and Axles (AR 4.7, Lexile 740). | |