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Pressing down : the lever
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Simple machines : wheels, levers, and pulleys
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The Way Things Work: Levers
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Pull, lift, and lower : a book about pulleys
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Castle under siege!: simple machines
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You wouldn't want to live without simple machines!
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Simple machines
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Move it! Work it! : a song about simple machines
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Levers
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Sensational science projects with simple machines
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Wheels
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How can I experiment with a lever
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Levers
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Make this! : building, thinking, and tinkering projects for the amazing maker in you
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The Way Things Work: Wheels & Axles
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The Way Things Work: Inclined Planes
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Experiments with simple machines
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Cut, chop, and stop : a book about wedges
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Tires, spokes, and sprockets : a book about wheels and axles
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Winding around : the screw
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Splitting apart : the wedge
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Let's look at monster machines
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How can I experiment with an inclined plane
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Rolling along : the wheel and axle
