Pressing down :
Bailey, Gerry, 1945-, author.
Pressing down : the lever / written by Gerry Bailey ; illustrated by Mike Spoor. - St Catharines, ON : Crabtree Publishing, 2013. - 32 p. ; col. ill. - The robotx get help from simple machines .
Includes index.
Explores the benefits and uses of the lever.
GRL: M
9780778704164 (bound) 9780778704225 (pbk.)
20139087095
Levers--Juvenile literature.
Simple machines--Juvenile literature.
621.8 BAI
Pressing down : the lever / written by Gerry Bailey ; illustrated by Mike Spoor. - St Catharines, ON : Crabtree Publishing, 2013. - 32 p. ; col. ill. - The robotx get help from simple machines .
Includes index.
Explores the benefits and uses of the lever.
GRL: M
9780778704164 (bound) 9780778704225 (pbk.)
20139087095
Levers--Juvenile literature.
Simple machines--Juvenile literature.
621.8 BAI