Encyclopaedia Britannica. 

 - London :   Encyclopedia Britannica,  c 1973. 
 - Vols. :   ill. ;  29 cm. 
<br/><br/>Vol.18-Plastics to Razin ;  
<br/><br/>344  344 
<br/><br/><label>ISBN: </label>0-85229-173-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedia<br/>Encyclopedias and dictionaries.
<br/><br/><label>Dewey Class. No.: </label>032 / E19