Environmental data report / 
prepared for UNEP by the GEMS Monitoring and Assessment Research Centre 
 - London :  United Nations Environment Programme,  1991 
 - 408 p. :  ill. ;  28 cm. 
<br/><br/> United Nations  Environment Programme 
<br/><br/><label>ISBN: </label>0631 
<br/><br/><label>LCCN: </label>91-009393 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pollution<br/>Environmental monitoring