Mackenzie, Clutha <br/><br/>
World braille usage :  A survey efforts towards uniformity of Braille notation / 
by Clutha Mackenzie 
 - Paris :  UNESCO,  1953 
 - vi, 172 p. :  ill. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Children<br/>Visually handicaped
<br/><br/><label>Dewey Class. No.: </label>371.911