Communicaciones libres. Rapports libres. Submitted papers. 

 - [Mexico] :  Universidad Nacional Autonoma de Mexico ,  1964. 
 - 6 v. in 3 ;  24 cm. (Its memarias, v.5-7) 
<br/><br/> Spanish, English, German, Italian, Portuguese and French. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Philosophy--Congresses.
<br/><br/><label>Dewey Class. No.: </label>106 INT