TY  - BOOK
TI  - Forces and machines
SN  - 9780022742898
AV  - TJ 147  .At887 1993
U1  - HS 621.8 
PY  - 1993///
CY  - New York : 
PB  - McGraw/Macmillan -Hill School Division,  
KW  - Machinery
KW  - Juvenile literature
KW  - Force and energy
KW  - Forces and energy
KW  - experiments
ER  -