Schonell, Fred J. <br/><br/>
Diagnosis of individual difficulties in arithmetic 

 - London :  Oliver and boyd,  1937 
 - 115p.;  18cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural sciences and mathematics
<br/><br/><label>Dewey Class. No.: </label>513  / SCH