MARTIN, D H H <br/><br/>
Commentary on the crossed-cylinder.  [electronic resource] 

 -  The Optician  Apr 1948 
 - 293 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0030-3968 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humans