Principles of light measurements 

 - Paris :  International Commission on Illumination, Bureau Central,  1970 
 - 1 v. 
 - Publication ;   no. 18 .
<br/><br/> At head of Title: International Commission on Illumination  English, French and German  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Photometry