Ballard,P.B. <br/><br/>
Group tests of intelligence 
Ballard,P.B. 
 - London  Hodder & Stoughton  1922 
 - x,252 pages 
<br/><br/><br/>In English 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mental tests
<br/><br/><label>Dewey Class. No.: </label>Dgi, 21(2)  1922