Simple machines
Subtitle: inventions that changed the world-- and the science behind them
By: written by Felicia Law & Gerry Bailey ; illustrated by Mike Phillips
Contributors: Bailey, Gerry; Phillips, Mike, 1961- illustrator
Series: Stone age science
Publisher: Crabtree Publishing
Published: 2016
Place of publication: New York, NY
Language: eng
Number of pages: 32
ISBN-13: 9780778718901; 9780778719175; 9781427116796; 9781427116758
Subjects: Simple machines; Juvenile literature
Notes: Includes bibliographical references (page 32) and index.

Age 10-13.

Grade 4 to 6.