Childcraft-The how and why library  : How things work (vol.-7) 
/ by Field Enterprises Educational corporation 
 - Chicago:  Field Enterprises Educational corporation,  1974. 
 - 336p. ; 24cm. 
<br/><br/><label>ISBN: </label>0716601753 
<br/><br/><label>Dewey Class. No.: </label>155  / FIE/C