What is a pulley? /
Douglas, Lloyd G.
What is a pulley? / Lloyd G. Douglas. - New York : Children`s Press, 2002. - 24 p. : col. ill.: 15 cm. - Simple machines .
Lex: BR
English
0-516-34024-2
Pulleys--Juvenile literature
Pulleys
621.811 D74w c2002
What is a pulley? / Lloyd G. Douglas. - New York : Children`s Press, 2002. - 24 p. : col. ill.: 15 cm. - Simple machines .
Lex: BR
English
0-516-34024-2
Pulleys--Juvenile literature
Pulleys
621.811 D74w c2002