General population characteristics  Puerto Rico = Características generales de la población  Puerto Rico. 

 - Washington  U. S. Govt. Print. Off.  1970- 
 - 169 p.  Appendix , p.1-20  maps., tables. 
 - Census of population. Characteristics of the population .
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico--Population--Statistics.<br/>Puerto Rico