TY  - BOOK
AU  - Royston,Angela
TI  - Pulleys and gears
T2  - How it works
SN  - 0431017433
U1  - 621.83 23
PY  - 2000///
CY  - Oxford : 
PB  - Heinemann Library , 
KW  - Pulleys - Juvenile literature ; Gearing - Juvenile literature
ER  -