TY  - BOOK
AU  - Holl, Kristi
TI  - Discovery the nature of gravity
SN  - 973-1-4777-2057-2
U1  - 531.14 H718 2015 
CY  - New York
PB  - The Rosen Pub.
KW  - Gravity
KW  - Juvenile literature
ER  -