The Perception and application of flashing lights :  an international symposium held at Imperial College, London, under the joint auspices of the National Illumination Committee of Great Britain and the Applied Optics Section, Imperial College, on 19- 

 - London :  Adam Higher,  c1971 
 - x, 429 p. :  ill. ;  23 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0852741391 :  ? 8.00 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Visual perception--Congresses<br/>Light--Congresses<br/>Signals and signaling--Congresses
<br/><br/><label>Dewey Class. No.: </label>535.8