Britannica book of the year 1971 
edited by Dean H. Schoelkpe 
 - Chicago  Encyclopaedia Britannica  1971 
 - 832p. 
<br/><br/><label>ISBN: </label>0-85229-158-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>NASA Thesaurus<br/>Year Books
<br/><br/><label>Universal Decimal Class. No.: </label>031  / EBR- YB 71