Encyclopaedia of Occupational Health and Safety 

 - Vol. 1I, L - Z 
 -  Geneva: International Labour Office  1972 
 - 755-1621pgs 
 - Encyclopaedia ILO Occupational Health 
<br/><br/><label>Nat. Bib. No.: </label>000395 
<br/><br/><label>Dewey Class. No.: </label>613.6(03) E51b