TY  - BOOK
AU  - Simon,David
TI  - Pulleys and gears
T2  - How Machines Work
SN  - 9833671101
U1  - 621.8 
PY  - 2006///
CY  - Triang, Pahang
PB  - Kedai Buku SBY
KW  - Machinery
KW  - Juvenile literature
KW  - Pulleys
KW  - Simple machines
N1  - Includes index
ER  -