What Is a Lever? - Douglas, Lloyd G
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Full-color photographs and simple text introduce young readers to the fundamentals of what makes things go in this first introduction to the mechanics that drive simple machines.

What Is a Lever? 2005, Children's Press(CT), New York, NY

ISBN-13: 9780516240220

Trade paperback

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What Is a Lever? 2005, Children's Press(CT), New York, NY

ISBN-13: 9780516239637

Hardcover

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