Janney, G. D. <br/><br/>
Worked problems in opthalmic lenses 
by G. D. Janney and A. H. Tunnacliffe 
 - London  Association of Dispensing Opticians  1983 
 - 159 p. : ill. ; 24 cm. 
<br/><br/><label>ISBN: </label>0900099178 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ophthalmic lenses<br/>Optics--Problems, exercises, etc