TY  - BOOK
AU  - Royston,Angela
TI  - Ramp and wedges
T2  - How it works
SN  - 0431017476
U1  - 621.811 23
PY  - 2000///
CY  - Oxford : 
PB  - Heinemann Library , 
KW  - Inclined plane - Juvenile literature
ER  -