TY  - BOOK
AU  - Douglas, Lloyd G.
TI  - What is a pulley?
T2  - Simple machines
SN  - 0-516-34024-2
AV  - 621.811 D74w c2002 
PY  - 2002///
CY  - New York
PB  - Children`s Press
KW  - Pulleys
KW  - Juvenile literature
N1  - Lex: BR
ER  -