Ziffer, Bernard <br/><br/>
The legal situation of work safety and hygiene in communist Poland / 
by Bernard Ziffer ; Free Europe Committee, Inc. Radio Free Europe. Research and Information Department Studies Branch. 
 - [S.l. :  s.n.],  1957. 
 - [1], 45 k. ;  28 cm. 
 - Studies in Management Vulnerabilities .
<br/><br/> Tyt. okł.  Maszynopis powiel. 
<br/><br/>Bibliogr. k. 43-45.