TY  - BOOK
TI  - Lever, wheel and axle, pulley
SN  - VCD
AV  - 621.8 L57 c1991 
PY  - 1991///
CY  - Niles, IL
PB  - United Learning
KW  - Levers
KW  - Wheels
KW  - Pulleys
KW  - Axles
KW  - Simple machines
ER  -