Clubb, Jerome M. <br/><br/>
Ecological data in comparative research :  report on a first international data confrontation seminar / 
Jerome M. Clubb. 
 - Paris :  UNESCO,  1970. 
 - 37 p. ;  fot. 
 - Reports and papers in the social sciences; 25 .
<br/><br/><label>No. de Clasificación Universal Decimal: </label>301.161: 659.25 =20 CLU.