Britannica book of the year 1973 
edited by Michel Silva 
 - Chicago  Encyclopaedia Britannica  1973 
 - 800p. 
<br/><br/><label>ISBN: </label>0-85229-282-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>NASA Thesaurus<br/>Yearbooks
<br/><br/><label>Universal Decimal Class. No.: </label>031  / EBR-YB 73