Air quality in selected urban areas 1975-1976 
/ World Health Organisation 
 - Geneva:   World Health Organisation,  1978 
 - 42p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environment
<br/><br/><label>Subjects--Index Terms: </label>Agency 
<br/><br/><label>Universal Decimal Class. No.: </label>502.55(203)(-201)  / L8