Obrig, Theodore Ernst. <br/><br/>
Modern ophthalmic lenses and optical glass, 
by Theo. E. Obrig. 
 - 3d ed. 
 - New York,  [Philadelphia,  The Chilton company, Printing division]  1944. 
 - xix, 323 p.  illus., diagrs. (1 fold.)  22 cm. 
<br/><br/>Bibliography: p. 302-306. 
<br/><br/><label>LCCN: </label>sg 45000050  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lenses.<br/>Optical glass.
<br/><br/><label>LC Class. No.: </label>RE961  / .O3 1944 
<br/><br/><label>Dewey Class. No.: </label>617.75