Thesaurus of eric descriptors 
/ Educational Resources Infromation Centre Bureau Of Research 
 - 2nd ed. 
 - Washington:   US Department of Health, Education and Welfare,   1969 
 - 289p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Thesaurus
<br/><br/><label>Universal Decimal Class. No.: </label>D 025.43:37  / K9