The provision of spectacles at low cost / 
World Health Organization. 
 - Geneva :  World Health Organization,  1987. 
 - 29 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>92-4-156108-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>World health organization<br/>Ophthalmology