Ray, Sidney F. <br/><br/>
The lens and all its jobs 
Sidney F. Ray 
 - London:  Focal Press,  1977. 
 - 158p. 
<br/><br/> PB 
<br/><br/>Includes bibliography 
<br/><br/><br/>eng 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lenses
<br/><br/><label>Dewey Class. No.: </label>681.42  / RAL