Frost, Helen, 1949-
What are wheels and axles? / by Helen Frost. - Mankato, Minn. : Pebble Books, c2001. - 24 p. : col. ill. ; 19 cm. - Looking at simple machines .
Includes bibliographical references (p. 23) and index.
0736808507
00009869
Wheels--Juvenile literature.
Axles--Juvenile literature.
621.8/11
What are wheels and axles? / by Helen Frost. - Mankato, Minn. : Pebble Books, c2001. - 24 p. : col. ill. ; 19 cm. - Looking at simple machines .
Includes bibliographical references (p. 23) and index.
0736808507
00009869
Wheels--Juvenile literature.
Axles--Juvenile literature.
621.8/11