THE NEW BOOK OF KNOWLEDGE Q-R 16 

 -  GROLIER  1977 
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<br/><br/><label>ISBN: </label>0-7172-0508-8 
<br/><br/><label>Source: </label> 78-72 
<br/><br/><label>Subjects--Topical Terms: </label><br/>TECHNOLOGY(APPLIED SCIENCES)
<br/><br/><label>LC Class. No.: </label>AG5.N273