Frost, Helen, 1949-
What are screws? / 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.
0736808485
00009868
Screws--Juvenile literature.
621.8/82
What are screws? / 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.
0736808485
00009868
Screws--Juvenile literature.
621.8/82