Paton, John <br/><br/>
CHILDREN'S  ENCYCLOPEDIA  (VOL - 3)  (COMMUNICATION   to ENGINE) 

 - London   Kingfisher  Books   1989 
 - 79 Pages  (157 - 236) 
<br/><br/><label>ISBN: </label>0862724678 
<br/><br/><label>Dewey Class. No.: </label>032  / PAT