Encyclopedia Britannica: A New Survey of Universal Knowledge Vol. XXIII (Vase-Zygo). 

 - Chicago :  Encyclopedia Britannica Inc.,  c1961. 
 - 999p.  illus (pbk)  29cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedia and Dictionaries--c1961--Chicago--Paperback