WHO, United Nations Environment Programme & ILO <br/><br/>
Nitrogen oxides 

 - 2nd ed 
 - auth, Geneva  1997 
 - xxiv,550p figs.,tabs. 
<br/><br/><label>ISBN: </label>92-4-157188-8 
<br/><br/><label>Dewey Class. No.: </label>363.7384 WHO/EHC