Annual report... = Informe anual, 1948/49-
Annual report... = Informe anual, 1948/49-
- San Juan, P.R. 1949-
- v. illus.
Water--Maintanance--Puerto Rico.
Water resources--Puerto Rico.
Puerto Rico--Water.
Water--Maintanance--Puerto Rico.
Water resources--Puerto Rico.
Puerto Rico--Water.