West, Parl,  1896-. <br/><br/>
A study of ability grouping in the elementary school in terms of variability of achievement, the teaching problem, and pupil adjustment / 
by Parl West. 
 - New York :  AMS Press,  1972. 
 - v, 70 p. :  diagrs. ;  24 cm. 
 - Contributions to education ;  no. 588. .
<br/><br/> Issued also as thesis (Ph. D.) Columbia University. 
<br/><br/>Bibliography: p. 69-70. 
<br/><br/><label>ISBN: </label>0404555888 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Grading and marking (Students).<br/>Ability.