TY  - BOOK
AU  - Ardley, Neil.
TI  - My science book of gravity
SN  - 9780863187988
U1  - 500 ARD 
PY  - 1992///
CY  - London
PB  - Dorling Kindersley, 
KW  - Gravitation
KW  - Juvenile literature
KW  - Gravity -- Measurement
KW  -  Experiments
N2  - 	
Simple experiments demonstrate the laws of gravity
ER  -