Emsley, Harold Heaton. <br/><br/>
Ophthalmic lenses /    
H. H. Emsley and Wm. Swaine. 
 - 6th ed. 
 - London :   Hatton Press ,   1951. 
 - viii, 339 p. :    ill. ;    22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Spectacles--------<br/>Lenses--------
<br/><br/><label>Dewey Class. No.: </label>617.75