Annual report... = Informe anual, 1948/49- 

 - San Juan, P.R.  1949- 
 - v.  illus. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Maintanance--Puerto Rico.<br/>Water resources--Puerto Rico.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Puerto Rico--Water.