Ecology of the subarctic regions :  proceedings of the Helsinki symposium. 

 - [Paris] :  UNESCO,  [1970] 
 - Ecology and conservation ;  1 .
<br/><br/> Added title, table of contents and preface in French. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology -- Arctic regions -- Congresses.--Ecology -- Arctic regions -- Congresses.--Ecology -- Arctic regions -- Congresses.