Keen, Martin L. <br/><br/>
Magnets and magnetism 
Martin L. Keen 
 - New York  Grosset and Dunlap  1971 
 -  47p. 
<br/><br/><br/>eng. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Magnetism
<br/><br/><label>Dewey Class. No.: </label>538  / KEM