Britannica book of the year 1971. 

 - Chicago :  Encyclopaedia Britannica.  c 1971. 
 - 832 p. :  ills. ;  30 cm. 
<br/><br/> Includes index. 
<br/><br/>304  304 
<br/><br/><label>ISBN: </label>0-85229-158-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedias & books of facts.--U. S. A.
<br/><br/><label>Dewey Class. No.: </label>030 / B19