Hay, William Howard <br/><br/>
Hay system of child development  William Howard Hay and Esther L. Smith. 

 - London  George G. Harrap  1936 
 - 224p. 19cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Medicine Smith, Esther L.  Diseases of childhood  Pediatrics. 
<br/><br/><label>Dewey Class. No.: </label>305.231  / H44H