Hygiene in shops and offices   " Forty - seventh session , 1963" 

 - Geneva  Intrnational Labour Office       1962 
 - 89p.  cm. 
<br/><br/><label>Standard No.: </label>150629 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Dewey Class. No.: </label>"X:9p1,N63, K3.6-1/UN"