Encyclopaedia Britanica, Vol 23 VASE to ZYGOTE /  Textual Documents 
Encyclopaedia Britanica,Ltd. 
 - Chicago :  Encyclopaedia Britanica,Ltd ,  1960. 
 - 999p ;  29cm. 
<br/><br/><label>Subjects--Index Terms: </label>Encyclopaedia Britanica T/Ref-Knowledge 
<br/><br/><label>Dewey Class. No.: </label>001  / En 19