Unit resource book:  waves, sound, and light/ 

 - Evanston, Illinois:  A Houghton Mifflin Company,  [c2007] 
 - viii, 310 pages:  illustrations;  28 cm. 
 - McDougal Littell Science .
<br/><br/><label>ISBN: </label>9780618406616 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Study and teaching (Middle school)
<br/><br/><label>Dewey Class. No.: </label>DK12 507  / Un58