I.P.S.A. <br/><br/>
World congress,9th 1973,Monetreal:working papers 
by I.P.S.A. 
 -     
<br/><br/><label>Subjects--Topical Terms: </label><br/>evolutions --Congresses.<br/>Fourth International --Periodicals<br/>Fourth International --Congresses
<br/><br/><label>Dewey Class. No.: </label>B209 In8/9/ptIII