HUTCHISON, D. E <br/><br/>
Sound waves / 
E. D. Hutchison 
 - Ontario  Gage educational publishing limited  c1975 
 - 80p.:  ill.; 
<br/><br/> include index 
<br/><br/><label>ISBN: </label>771574193 
<br/><br/><label>Dewey Class. No.: </label>620.2 HUT