Hay, William Howard <br/><br/>
The Hay system of child-development/ 
William Howard Hay and Esther L. Smith 
 - London:  George G. Harrap,  1936 
 - 224 p.;  19 cm. 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Child development<br/>Child rearing<br/>Children--Health and hygiene<br/>Developmental Biology
<br/><br/><label>Dewey Class. No.: </label>649.1