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 19-22 April 1971. 

 - Toronto :  University of Toronto Press,  c1971. 
 - x, 429 p. :  ill. ;  22 cm. 
<br/><br/>Includes bibliographies, index. 
<br/><br/><label>ISBN: </label>0802018564 
<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>625.794  / PER