TY  - BOOK
AU  - Knapp,Brian J.
TI  - Forces
T2  - Visual science encyclopedia
SN  - 1862140146 :
U1  - 531.6 21
PY  - 2002///
CY  - [Henley-on-Thames]
PB  - Atlantic Europe
KW  - Force and energy
KW  - Juvenile literature
N1  - Includes index
ER  -