[GROUP WATER SUPPLY FOR POPULATION POINTS AND THEIR SANITARY SUPERVISION IN THE PEOPLE'S REPUBLIC OF BULGARIA].
D002031:Bulgaria; D014881:Water Supply
BULGARIA; WATER SUPPLY
GRUPPOVOE VODOSNABZHENIE NASELENNYKH PUNKTOV I SANITARNY I NADZOR ZA NIM V NARODNO I RESPUBLIKE BOLGARII.