TY  - BOOK
AU  - Sonneborn,Liz
TI  - Forces in nature: understanding gravitational, electrical, and magnetic force 
T2  - The library of physics
SN  - 140420332X
PY  - 2005///
CY  - New York
PB  - Rosen Pub.
KW  - Electromagnetism
KW  - Gravitation
N1  - Includes bibliographical references (p. 46-47) and index; The forces around us -- The gravitational force -- The electromagnetic force -- Electromagnetism at work -- The strong and weak forces -- The unification of forces
ER  -