Lay, L. Clark. <br/><br/>
The study of arithmetic / 
L. Clark Lay. 
 - New York :  Macmillan,  c1966. 
 - xv, 590 p. 
<br/><br/><label>LCCN: </label>66-23918 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmetic--Study and teaching (Elementary).<br/>Arithmetic--Study and teaching (Secondary).<br/>Mathematics--Study and teaching (ELementary).<br/>Mathematics--Study and teaching (Secondary).