State of the environment    First report.    

 - Europe  Commission of the European Communities        1977 
 - 261p.  cm. 
<br/><br/> Bibliography : P.256-261 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>U:(G:%%).N77r, L7