Sonneborn, Liz. <br/><br/>Forces in nature:  understanding gravitational, electrical, and magnetic force/ Liz Sonneborn.  -- New York, New York:  The Rosen Pub.,  2005. <br/>48 p.:  col ill.;  24 cm. <br/><br/> Includes bibliographical references, glossary and index. <br/><br/><label>ISBN: </label>140420332X <br/><br/><label>Subjects--Topical Terms: </label><br/>Electromagnetism.<br/>Gravitation.<br/><br/><label>Dewey Class. No.: </label>GR 537 So591 2005