TY  - BOOK
AU  - THOMPSON Gare
TI  - Simple machines
SN  - 9781740655927 (pbk) :
PY  - 2002///
CY  - 
PB  - National Geographic
KW  - MACHINERY-EXPERIMENTS-JUVENILE LITERATURE
N2  - Describes the work of six simple machines: pulley, lever, screw, wedge, inclined plane, wheel and axle
ER  -