Machines: Simple and Compound
- ISBN-10
- 0792254392
- ISBN-13
- 9780792254393
- Series
- Machines
- Category
- Education
- Pages
- 36
- Language
- English
- Published
- 2007-03-21
- Publisher
- National Geographic
- Authors
- National Geographic Learning, Rebecca L. Johnson
Description
Machines make work easier to do.
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