Mason, Conrad. An Usborne flap book see inside how things work / Conrad Mason ; illustrated by Colin King ; with over 90 flaps to lift. - London : Usborne, 2009. - 15 p. : ill. ; 27 cm. ISBN: 9780746098516 Subjects--Topical Terms: Machines--Juvenile literature. LC Class. No.: TJ1185 / .M37 2009