Environment conservation /  Switzerland 

 - Switzerland :    c1981. 
 - 128 p.:  24 cm. 
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<br/><br/><br/>English 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Pollution<br/>Water conservation<br/>Environmental policy
<br/><br/><label>Dewey Class. No.: </label>628/SWE