London conference of optical instruments 

 -  1951 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>48864 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Radiation
<br/><br/><label>Dewey Class. No.: </label>C5ep3:N50, J1