Block statistics = Estadísticas por manzanas. 

 - Washington  U.S. Govt. Print. Off.  1960- 
 - v. 
 - Census of Housing; .
<br/><br/> Title varies : City blocks, 1960. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Housing--Statistics.--Puerto Rico
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico<br/>Mayagüez (P.R.)<br/>San Juan P.R..<br/>Ponce (P.R.)
<br/><br/><label>GPO Item No.: </label>0156-A-41