Duke-Elder, Stewart,  Sir <br/><br/>
Duke-Elder's practice of refraction / 
by Stewart Duke-Elder 
 - 9th ed. 
 - Edinburgh :  Churchill Livingstone,  1978 
 - 204 p. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label>0443014787 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Refraction, Ocular<br/>Practice of refraction
<br/><br/><label>National Library of Medicine Call No.: </label>WW300  / .D877d 1978